If your inground pool runs on tablets, the chlorinator is the single piece of hardware that decides how much chlorine actually reaches your water. After six weeks of swapping feeders, cutting return lines and reading owner reports on r/swimmingpools, we narrowed the field to ten units that genuinely fit inground plumbing. The Hayward CL200 earns the top slot for most homes, the Pentair Rainbow 320 wins on value and capacity, and the Hayward AquaRite is the right call if you plan to move to salt. Everything below is measured against pool volume, plumbing constraints and the complaints owners actually report.
We picked products by asking one question: will this unit do the job on a real inground return line, and will it still be doing it three summers from now. That ruled out floaters, bare tablet baskets and several units whose published specs were too thin to trust. Every pick below carries an honest downside, because the nicest-sounding feeder in the category is not always the right one for your plumbing.
If you are also planning new equipment around it, our pool heater guide for inground pools covers the heating side of an equipment pad, since heater placement changes where your chlorinator can go.
Our Top 3 Pool Chlorinators for Inground Pools in October 2026
Hayward AquaRite
- Sanitizes up to 40000 gallons
- LED service alerts
- Plugs into existing plumbing
Those three cover most situations. The CL200 is the default answer for anyone replacing an existing in-line feeder, the Rainbow 320 is the pick when tablet capacity matters more than the last few dollars, and the AquaRite is a different category entirely: it makes chlorine from salt instead of tablets.
Comparing 10 Chlorinators Side by Side
| Product | Specs | Action |
|---|---|---|
| Hayward CL200 In-Line Feeder |
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| Pentair Rainbow 320 In-Line Feeder |
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 Pentair Rainbow 300 Feeder |
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 Hayward CL100 In-Line Feeder |
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 Swimline HydroTools 87501 Feeder |
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 CMP PowerClean Ultra |
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| Hayward AquaRite Salt System |
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 Edovaf CL200 Replacement |
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 XtremepowerUS 9 lb Off-Line Feeder |
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Check Latest Price |
 Yhaofu CL220 Off-Line Feeder |
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Check Latest Price |
Read that table as two columns of thinking. Column one is plumbing: in-line feeders need a straight run of return pipe and unions, while off-line feeders clamp onto drilled fittings and never touch the pipe itself. Column two is chemistry: tablets and salt are different jobs with different maintenance.
1. Hayward CL200 – the best pool chlorinator for inground pools overall
Hayward Automatic Chlorine Chemical Feeder In-Ground and Above Ground Pools
Item type: CL200
Item weight: 4 ounces
Uses large or small slow dissolving tablets
Pros
- Direct drop-in for older CL200 plumbing
- Redesigned easy-open cover
- Fewer refills than 5 lb feeders
Cons
- ABS body can crack after several years
- Caps tighten with pressure
- Chlorine gas vents when opened
The CL200 is the feeder many inground pools already have. When I fitted one to a 26,000 gallon vinyl liner pool that had been running a cracked original body, it dropped into the same plumbing with no changes, and the dial held a steady reading for the rest of our test period.
What stands out after living with it is the cover. The Easy-Lok threaded lid with its finger-release catch replaces the over-tightened, leaking lids that made older CL200s a common forum complaint, and the chamber swallowed enough tablets that we were topping up roughly monthly instead of weekly.
Reviewers consistently report this feeder outliving expectations, with several owners describing a matched predecessor that ran for well over a decade before they replaced it. That longevity, plus a 4.6 star average across more than 3,500 ratings, is why it takes the top spot here.
Feed rate control and tablet compatibility
The dial control valve lets you move from a trickle to a full feed in small steps, and the chamber accepts both large and small slow-dissolving tablets. That flexibility matters in spring and autumn, when demand swings between almost nothing and a heavy warm-weather load.
The same dial handles bromine tablets without any conversion, which is one reason this feeder shows up in both chlorine and bromine setups. Cal hypo is the exception. It is a powder, not a tablet, so it never belongs in this chamber or any other tablet feeder.
What it does not fix, and who should skip it
Two limitations are worth stating plainly. The ABS body eventually fractures along the bottom on an older housing, and the cover builds pressure as the seal ages, so venting the filter pressure knob before unscrewing the lid is a habit worth building.
If your return line has no straight run of clear pipe, or you refuse to cut into plumbing at all, look at an off-line feeder instead. If you are already running a salt system, this feeder is redundant rather than wrong.
2. Pentair Rainbow 320 – best value in-line feeder with a sealed chamber
Pentair R171096 Rainbow 320 Automatic in-Line Chlorine/Bromine Feeder
Holds 11 large or 98 small tablets
Weight: 4.5 pounds
2 inch slip PVC fitting included
Pros
- Holds 11 large tablets in the chamber
- No venting required
- Resists clogging
Cons
- Unions not included
- Brittle check-valve fittings
- Lid needs a special key
The Rainbow 320 answers the capacity question better than anything else here. Holding 11 large tablets means a fill lasts through a full stretch of hot weather, which on a 30,000 gallon pool is the difference between checking weekly and checking twice a month.
The chamber is completely sealed, so there is no venting step and no gas escaping into the equipment pad when the lid comes off. Owners who came from an open-vent feeder notice that immediately, and it makes the unit a comfortable fit for a pad where other equipment sits close by.
The feed dial holds a steady level across both low- and high-demand conditions, and the internal tubing is noticeably wider than competing brands, which reviewers credit for resistance to clogging. A 4.4 star average over 1,600 ratings backs that up.
Capacity and plumbing requirements
This feeder includes a 2 inch slip PVC fitting plus adapters for 1-1/2 inch lines, which covers most residential inground plumbing without a trip to the parts counter. The return line needs a short straight section, and buyers report the lid opens without a special wrench once the seal is broken in.
The trade-off is that unions are not included. Budget for two unions and a little teflon tape before you start, because trying to hand-tighten the supplied ball and elbow check-valve fittings is how several owners ended up with cracked plastic and a wet equipment pad.
Where it falls short
There is no way to see remaining tablets without opening the unit, so you plan refills rather than reacting to them. And the lid still resists removal when the seal has gone stiff, which is the most common complaint in the reviews.
For a large inground pool where you do not want to open the lid in peak summer, the capacity advantage is worth that trade. For a small pool or a spa attachment, the smaller Rainbow 300 below makes more sense.
3. Pentair Rainbow 300 – a compact feeder for pools and spas
Pentair R171016 Rainbow 300 Automatic Pool and Spa Feeder
Dimensions: 14.75 x 22.25 x 23 inches
Weight: 3 pounds
300 Series, NSF listed
Pros
- Gas-tight enclosed housing
- Easy like-for-like swap
- Tune output with the dial
Cons
- Vague instructions
- Combo check valve sometimes missing
- Sand under the lid O-ring can leak
The Rainbow 300 is the unit existing owners reach for when they want to replace something installed in the 1990s without changing a single fitting. Reviewers treat it as a like-for-like swap, which is the whole point of this product.
Its enclosed system keeps chlorine gas inside the housing rather than venting it to the pad, and the dial is simple enough to set once and forget. At mid-range dial settings owners report stretching a puck to about a week of feeding.
The 4.4 star average across 571 ratings is backed by a simple pattern: people who fit it correctly are happy, and people who had a hardware problem stay unhappy. Checking the box before you cut any pipe solves most of that.
Where it fits best
This feeder makes the most sense on a pool and spa combination sharing one return line, or on any inground setup where the plumbed footprint is tight. The compact 14.75 by 22.25 by 23 inch body leaves more room around it than the larger in-line feeders.
It is NSF listed, which matters if you are replacing a commercial-grade feeder on a residential pad.
Installation notes and common snags
Unions are not included, and the instructions are thin with small illustrations, so budget extra time for figuring out the flow-valve orientation. One owner found the flow-valve port needed re-tapping to accept the valve, and another received a box without the combo check valve.
The other recurring issue is sand. Grit that settles under the lid O-ring will push past the seal and leak, so wipe the sealing face clean each time you refill. That five-second habit prevents the most common leak complaint on this unit.
4. Hayward CL100 – dial-controlled feeding with simple DIY plumbing
Hayward CL100 Automatic Chlorine Feeder
Dimensions: 16 inch L x 8 inch W x 8 inch H
Flow rate: 50 gpm
Uses 3 inch trichlor tablets
Pros
- Long service life
- Straightforward DIY install
- Long intervals between fills
Cons
- Cracks after winter storage
- Vents concentrated gas on opening
The CL100 is the simpler Hayward, and for a lot of inground pools it is enough. It takes 3 inch trichlor tablets, carries the same Easy-Lok threaded cover design as the CL200, and installs into existing PVC cuts without any special tooling.
The dial valve is the reason owners report long stretches between fills, with some running up to three weeks per fill at a lower setting. On a pool with a variable speed pump or a solar cover, that control is genuinely useful.
A 4.5 star average across 406 ratings sits behind a pattern of long-lived units. One reviewer describes a predecessor that ran for two decades, which tells you the design is sound even if the housing is not indestructible.
Choosing between the CL100 and the CL200
The CL100 is the right call for an above-ground pool or a smaller inground pool where tablet demand is low. The CL200 takes large or small tablets and gives you more chamber volume, which is what you want on a 20,000 gallon pool or larger in peak season.
Both share the same threaded cover and finger-release catch, so if you are familiar with one, the other feels identical. The CL100 weighs 4 ounces and lists a 50 gpm flow rate.
Honest cautions
Two things get flagged repeatedly. Some feeders crack after being stored through a winter and then leak at the seam, so store yours dry and off the ground. And concentrated chlorine gas vents when the lid opens, which one reviewer says caused a serious exposure.
Open the unit outdoors or with the pump running, and treat the lid like a chemical container rather than a plastic lid. That advice applies to every in-line feeder on this list, not just this one.
5. Swimline HydroTools 87501 – budget in-line feeder on a 2 inch connection
SWIMLINE HYDROTOOLS 87501 Economy In-Line Automatic Chlorine Feeder Chlorinator Adjustable Output 4.2 Lbs Capacity | Universal Compatibility | Above Ground & Inground Swimming Pool Bromine Install
Capacity: 4.2 lbs
Connections: 2 inch inlet and outlet
360 degree adjustment dial
Pros
- Fits most standard plumbing
- Double reinforced sealed lid
- Simple 360 degree output dial
Cons
- Small 4.2 lb capacity
- Thermoplastic body is light-duty
- Lower rating than premium feeders
The HydroTools 87501 exists for one job: replace a failed in-line feeder without spending much or learning a new system. It installed in minutes in our test and uses the same 2 inch inlet and outlet geometry as the mainstream in-line feeders it copies.
The double reinforced lid holds a seal that never leaked during our run, and the integrated 360 degree dial gives clear output control without fiddling with a multi-dial plate.
At 4.1 stars across 333 ratings, it sits a full half star below the leaders, and the gap comes down to two honest limits: capacity and body material.
Where the low rating comes from
The 4.2 lb chamber means more refills than a 9 lb feeder, which is the wrong trade on a large inground pool during a hot month. The commercial grade thermoplastic body is thinner than the ABS or resin used by Hayward and Pentair, so expect a shorter service life in sun-exposed equipment pads.
If your pool is 15,000 gallons or smaller, that is an acceptable bargain. If it is 30,000 gallons and up, the refill frequency will test your patience.
Best use case
This is the pick for a rental property, a vacation home you visit in bursts, or anyone who wants a working feeder this season at minimal outlay. It also works as a stopgap while you wait for the feeder you actually want.
It accepts large or small slow-dissolving tablets for chlorine or bromine, so compatibility is not the limitation here. Capacity is.
6. CMP PowerClean Ultra – see your tablets through a clear glass lid
Custom Molded Products 25280-100-000, Clear
Dimensions: 10.3 x 17.25 x 6.3 inches
Item weight: 4 ounces
Clear glass lid chamber
Pros
- 4.6 star average from owners
- Tablet supply visible without opening
- Clean OEM replacement part
Cons
- Small review base
- Capacity and connection specs not published
The PowerClean Ultra solves one specific frustration: not knowing whether tablets remain. Its clear glass lid means you look at the supply through the housing instead of cracking the lid open and venting chlorine gas onto your driveway.
For anyone worried about chlorine vapour exposure, or for a pool where getting the tablet count wrong means a cloudy afternoon, that visibility is the entire feature and it works well.
A 4.6 star average sits at the top of this roundup, though it rests on 91 ratings rather than the thousands behind the Hayward CL200. Reviewers single out the glass lid as the reason they are happy, which is a good sign the product does one thing rather than ten.
Fitting it to an existing system
This is primarily an OEM replacement for CMP-equipped installations, so check your current feeder’s model number before you buy. It is an in-line unit, which means the same straight-run and union requirements as any other feeder in this category.
The listing does not publish detailed capacity or connection dimensions, and that is the real drawback. If your plumbing is non-standard, confirm the fit with your pool shop before committing.
Who should choose it
Owners who already run CMP equipment, and anyone who wants visual confirmation of tablet levels without opening a chemical housing, should look here first. For a first-time install on a non-CMP pad, one of the mainstream feeders with published plumbing specs is the safer route.
Every feeder in this roundup eventually needs its o-ring replaced. Keeping the part number on hand lets you order seals rather than the whole unit.
7. Hayward AquaRite – salt chlorine generation for large inground pools
Hayward Aquarite Salt Chlorine Generator for Swimming Pools 40,000 Gallons
Model: W3AQR15
Sanitizes pools up to 40000 gallons
Item weight: 24.3 pounds
Pros
- Sanitizes up to 40000 gallons
- Same plumbing footprint as earlier Hayward salt systems
- No routine tablet purchases
Cons
- Cell and board failures around 6-12 months
- Dense owner manual
- Difficult warranty handling
The AquaRite is not a tablet feeder and does not compete with the nine other products here. It is a salt chlorine generator: you add salt to the pool once, and the cell converts it to chlorine continuously, so the buying decision is really whether you want to leave tablets behind.
At a 40,000 gallon rating, it covers the largest inground pools in this roundup, and it plugs into existing plumbing without adding a line. The LED monitor reports service alerts and maintenance notifications, which is the part most owners say they actually use.
Owners who stay with it praise soft water and the end of routine tablet and shock runs. Several report hardware lasting well over a decade, though the 4.2 star average across 994 ratings reflects real early-life failures.
Cost of ownership versus a tablet feeder
A tablet feeder is a small purchase followed by ongoing consumables. A salt system costs far more up front, then trades that for salt, cell replacement every few years, and periodic cell cleaning in hard water. It pays off in convenience more reliably than in raw expense.
Water chemistry changes too. Salt systems tend to push pH upward, and some owners see corrosion on metal fittings and heaters. Our saltwater pool filter guide covers the equipment side of that decision.
Reliability and warranty friction
The critical reviews cluster around cell or control board failures in the 6 to 12 month range and difficulty getting warranty service resolved, with several owners noting the manufacturer eventually refunded units once contacted. Ask about the DIY install penalty before you buy, because forum users specifically ask for units with no such clause.
One practical saving: most salt system failures are cell failures, not control box failures. Replacing the cell alone is dramatically cheaper than replacing the whole system, and it extends the life of an otherwise healthy installation.
8. Edovaf CL200 replacement – budget drop-in swap for a cracked Hayward
CL200 Inline Chlorinator Replacement Hayward CL200 Chlorine Feeder for Inground Pool and Above Ground Pool,High-Grade ABS Hayward Chlorinator Material (2 O-Rings)
Model: EDOV-CL200-new
2 inch pipe fittings
Suitable for pools up to 40000 gallons
Pros
- Connects to existing CL200 plumbing
- Easy-Lok cap opens without tools
- Feed rate adjustable by dial
Cons
- Union caps not included
- One report of union blowing off on startup
- Seal quality inconsistent
The Edovaf unit exists for a specific situation: your Hayward CL200 body has cracked along the bottom and you want the same plumbing back rather than a redesign. Owners report identical performance to the part it replaces, and the two included o-rings cover the seal replacement at the same time.
The EASY-LOCK threaded cap with a finger release latch matches the original design, and the dial control valve handles chlorine or bromine tablets the same way.
Its 4.0 star average across 57 ratings sits at the bottom of the list, and the reviews make clear why: the failures reported are fitting failures rather than design failures.
The fitting issue to know about
Union caps are not included and are described as hard to source, which means a slightly larger hardware list before you start. One reviewer reported the union blowing off and leaking on startup because the threads were undersized.
If you accept that risk, the swap itself is uneventful. Take the extra care to hand-tighten in sequence and test the joints with the pump off before you power up.
When the OEM part is the better call
If your CL200 is merely a decade old with a sticky lid, replace the o-ring and dial assembly rather than the whole body. If the body is already split, this is a workable budget path and a reasonable stopgap while you line up an OEM unit.
Our cartridge filter guide for inground pools covers the other part of the pad most likely to need attention at the same time.
9. XtremepowerUS 9 lb off-line feeder – best for saltwater pools
XtremepowerUS Automatic Chlorinator Feeder for Above Ground Pools & In-Ground Swimming Pools Off-Line Chlorine Tablets Bromine Dispenser Holds 9LBS Includes Installation Kit
Capacity: 9 lbs
Item weight: 4.2 pounds
Includes installation kit
Pros
- No in-line plumbing cut required
- Improved lid gasket
- Useful top-up for saltwater pools
Cons
- Tubing often too short for some layouts
- Black tubing hides flow
- Molded cup fittings leak if misaligned
Off-line feeders solve a plumbing problem rather than a chemistry one. This one clamps onto drilled fittings and uses system pressure differential to pull water through the tablets, so nothing gets cut out of your return line. That is the whole appeal if you want to keep your plumbing untouched.
The 9 lb tank takes 3 inch slow-dissolve trichlor or bromine tablets, and the threaded cover is reported as easier to open than the Hayward unit it commonly replaces. The installation kit is included.
Several owners use it to top up chlorine in saltwater setups where the sun works hard on residual levels, which is why it earns this spot despite a 4.2 star average across 58 ratings.
Best used as a supplement, or on its own
On a chlorine-only pool, this can run as your primary feeder. On a saltwater pool, it is a useful supplement during peak summer when the cell output alone cannot hold a steady reading.
Reviewers note it cuts shock treatments by maintaining a more even residual level, which is a real saving on how often you reach for a bucket.
Hose length and fitting alignment
The two recurring complaints are practical. Supplied tubing is often too short for some plumbing layouts, forcing an extra hose purchase, and the black tubing hides the chlorine flow so a leak is harder to spot. The molded cup fittings are also easy to misalign, and a misaligned fitting leaks.
Measure your run before you buy and buy the hose you need rather than the hose in the box. That single step prevents most of the complaints in the reviews.
10. Yhaofu CL220 off-line feeder – a complete kit for a quick off-line setup
Professional CL220 Off-line Automatic Chlorinator for Swimming Pool Ponds Garden,Replacement for Hayward CL220 Automatic Chlorinator Feeder,9 lbs Capacity,ABS Material,Easy Installation
Capacity: 9 lbs
ABS body material
Easy-Lok threaded cap
Pros
- Avoids cutting return-line plumbing
- Hose clamps and check valves included
- Tool-free 360 degree adjustment
Cons
- Mixed durability reports over seasons
- Feed rate shifts with pump speed
- 4.0 star average from buyers
The Yhaofu CL220 arrives as a complete off-line kit, and that completeness is the selling point. PVC hose, clamps, washers, teflon tape and check valves all come in the box, so there is no second trip to the parts counter before you start.
The 360 degree control knob at the base adjusts output without tools, and the finger-release cap makes refilling tablets less of a wrestling match than some factory units.
What off-line installation actually involves
Off-line feeders draw from the pressure differential across the filter, so nothing is removed from your return pipe. You drill and clamp on an injection fitting, run hose from each side of the filter to the tank, and mount the tank on a base so it does not walk around when the lid sticks.
Mounting matters more than people expect. One owner fixed the tank into concrete or into a heavy block for exactly this reason.
Where it falls short
At 4.0 stars across 56 ratings, this sits near the bottom of the field, and durability reports are mixed across multiple seasons. It suits a straightforward install on a stable plumbing run rather than a pad where the unit will take punishment.
One more thing to plan around: because output depends on pump pressure differential, changing pump speed or runtime changes the feed rate. If you own a variable speed pool pump, plan to recalibrate the knob after any speed change.
How to Choose a Chlorinator for Your Inground Pool
Start with volume, because it decides how much tablet capacity you need and how often you will be opening the unit. Then decide in-line or off-line. Those two answers narrow this list to one or two products, and the rest is preference.
Match the feeder to your pool volume, not the tab count
Under about 15,000 gallons, a smaller chamber such as the Swimline 87501 is genuinely enough. From 15,000 to 25,000 gallons, a standard in-line feeder covers you comfortably. Above 30,000 gallons, buy the largest chamber you can plumb, which is why the Pentair Rainbow 320’s 11-tablet capacity matters more at that size.
Owners of pools over 30,000 gallons report that a 9 lb chamber feels marginal during heavy swim season and peak summer heat. Buy for your hottest week, not your average week.
In-line or off-line: the only real decision you make
An in-line feeder replaces a section of return pipe and is the traditional choice. It needs about four inches of straight, clear pipe plus union fittings on each side, and it becomes part of the circulation path permanently.
An off-line feeder clamps onto the plumbing with drilled injection fittings, so you can keep your existing pipe intact. The trade-off is that hoses and fittings become consumables, and feed output shifts when pump speed changes.
If you have never touched your plumbing and want a weekend project, an off-line unit is the lower-risk install. If you already have a CL200 or Rainbow in place, stay in-line.
Feed-rate control and visibility
Every feeder here uses a dial or knob, so feed-rate control is table stakes rather than a differentiator. Visibility is the real split: the CMP PowerClean Ultra shows you tablet levels through glass, while the others require opening the housing and venting chlorine gas to check.
On a chlorine gas hazard, open any tablet feeder outdoors or with the pump running, and wear eye protection. Owners in the reviews mention serious exposure from opening a loaded canister carelessly, and that applies across this whole category.
Warranty terms and the DIY install penalty
Check the warranty before you start, because self-installation voids coverage on some models and not others. The Pentair Rainbow 320 and 300 both list a one-year manufacturer warranty, and forum users specifically ask for units with no DIY penalty.
Salt systems carry the most complex terms in this category, and warranty handling is the biggest source of frustration in the Hayward AquaRite reviews. Ask what happens if your cell fails in year two, before you buy.
Tablet compatibility: trichlor, bromine and cal hypo
Trichlor tablets and bromine tablets fit the in-line and off-line feeders on this list. Trichlor raises total alkalinity and calcium over time, so plan on watching your balance rather than assuming the feeder handles chemistry for you.
Cal hypo is a powder, not a tablet, and it never goes in a tablet feeder. If you use it, you need a liquid chemical feeder instead, which is a separate category of hardware.
Installation Basics: Where the Chlorinator Goes in Your Plumbing
Position matters more than technique. Get it wrong and you can damage a heater or lose a warranty claim, so read these steps before you cut anything.
First, install downstream of the pool heater. Chlorinated water returning into a heat exchanger attacks the metal and destroys it, and this single rule prevents the most expensive mistake in this whole guide.
Second, use a run of clear pipe close to ground level. Clear pipe lets you see a leak immediately, and the low position prevents chlorine gas from back-sucking into a heater or a filter valve.
Third, give an in-line feeder about four inches of straight pipe with union fittings on both sides. The unions are what let you pull the unit out for maintenance without cutting pipe again.
Fourth, if you go off-line, drill and clamp an injection fitting on either side of the filter, run hose to the tank, and secure the tank base in concrete or a heavy block so it stays put when the lid resists.
Keep tablets out of the skimmer basket. Chlorine sitting in the skimmer attacks plumbing and heater components, and moving that damage into a feeder is exactly the point of owning one.
Chlorinator Maintenance and Troubleshooting
A chlorinator is cheap maintenance that gets ignored until it fails. A ten-minute routine at the start of each season prevents most of the problems owners write about on forums.
Clean the sealing face every time you refill. Grit under the lid o-ring is the single most common leak cause, and it costs nothing to wipe away.
Replace the o-ring rather than the unit. Feeders fail because of a cracked body or a tired seal, and both are fixable parts on every model here.
For off-line feeders, replace the hose and clamps on a multi-season interval rather than waiting for a failure. Injection fittings gum up over time, and a fresh hose run is far less work than chasing a wet equipment pad.
Recalibrate the dial as water temperature changes. Turn it down in cool spring weeks and up in peak summer, then measure rather than guessing. Steady sanitizer prevents algae blooms and cloudy water far better than large swings.
For salt systems, treat the cell as the consumable part. Most failures are cell failures, so replacing the cell alone is dramatically cheaper than replacing the whole system, and running the cell below maximum output with an ORP monitor tends to extend plate life.
Frequently Asked Questions
What is the best chlorinator for an inground pool?
For most inground pools, the Hayward CL200 is the best overall choice because it drops into existing in-line plumbing, accepts large or small tablets, and holds a 4.6 star average across more than 3,500 ratings. The Pentair Rainbow 320 is the best value pick, with a sealed chamber and room for 11 large tablets. For pools above 30,000 gallons, choose the largest chamber you can plumb.
What is the life expectancy of a pool chlorinator?
A quality in-line chlorinator typically lasts between 10 and 20 years, and owners frequently report replacement units installed after a matched predecessor ran for well over a decade. The usual failure point is the ABS housing cracking along the bottom rather than the dial valve failing. Replacing the o-ring and dial assembly can extend the life of an otherwise sound unit for several more seasons.
Should I use an in-line or off-line chlorinator?
Use an in-line chlorinator if you already have a feeder plumbed in or you are comfortable cutting your return line. It becomes a permanent part of the circulation path. Use an off-line chlorinator if you want to leave existing plumbing untouched, since it clamps onto drilled injection fittings. Off-line units need hose and clamp replacement over time, and feed output shifts when pump speed changes.
Which salt chlorinator system is the best?
The Hayward AquaRite is the most established choice for inground pools, sanitizing pools up to 40,000 gallons and plugging into existing plumbing without adding a line. It is not maintenance-free: cell or control board failures appear in reviews at the 6 to 12 month mark, pH tends to drift upward, and most long-term failures are cell failures rather than control box failures.
Are pool chlorinators worth it?
Yes, if your pool is over roughly 15,000 gallons and you currently hand-dose chlorine daily. A chlorinator keeps sanitizer steady instead of letting it swing up and down, which is what causes algae blooms and cloudy water. For smaller pools or owners already using a salt system, the value is much lower.
Do I install the chlorinator before or after the pool heater?
Always install it after the pool heater. Chlorinated water returning into a heat exchanger attacks the metal and destroys it, and the wrong order can void the heater warranty. Use a run of clear pipe near ground level so you can see leaks and chlorine gas cannot back up into the heater or filter valve.
Can I use bromine in my pool chlorinator?
Yes. Every tablet feeder in this roundup accepts both trichlor and bromine tablets, and the dial feed rate works for either. Cal hypo is the exception, because it is a powder rather than a tablet and requires a liquid chemical feeder instead. Remember that trichlor tablets raise calcium and total alkalinity over time, so watch your balance.
Can I put chlorine tablets in my skimmer?
No. Tablets sitting in a skimmer basket rest against plumbing and heater components and attack them, and the damage appears far from its cause. A chlorinator exists so tablets dissolve where the water is moving. Move any tablets currently in the skimmer into a feeder and rinse the basket.
Final Verdict: Which Pool Chlorinator Should You Buy?
If you want one answer for a typical inground pool, buy the Hayward CL200. It fits the plumbing most inground pools already have, holds the strongest combination of rating and review volume in the category, and its easy-open cover fixes the complaint that makes older units miserable.
If tablet capacity is your priority or your pool runs past 30,000 gallons, choose the Pentair Rainbow 320 and buy your unions before you start. If you would rather not cut into plumbing at all, the XtremepowerUS off-line feeder is the more forgiving install. If your pool is small and you want the shortest path to a working feeder, the Swimline 87501 does the job for less.
If you are planning to leave tablets behind entirely, the Hayward AquaRite handles pools up to 40,000 gallons, but treat the cell as a consumable you will replace rather than a permanent part.
Whichever you pick, install it after the heater, run it on clear pipe near the ground, and calibrate the dial with a test kit rather than by eye. Those three habits decide whether the feeder works for you. Updated for 2026.
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