A floater wedged under the pool steps, tablets dissolving in a skimmer basket that nobody drains for three days, and a chlorine reading of zero the morning you get home from a week away. If any of that sounds familiar, you are already partway to understanding the best pool chemical feeders for home pools, because every one of those problems traces back to the same thing: chlorine that nobody is metering on purpose.
A chemical feeder takes the guesswork out. It holds slow-dissolving tablets in a canister and lets filtered return water wash through them at a rate you set on a dial, so the pool holds a steady free available chlorine reading instead of spiking after a manual dose and crashing by the next morning. Once ours was dialed in properly, we stopped noticing the feeder entirely, which is the highest compliment a pool device can earn.
We spent weeks cycling through nine feeders across in-line, off-line and floating designs, checking capacities, lid seals, dial ranges and the small details that decide whether a unit lasts four seasons or four months. Before the recommendations, here is what the category actually contains and how the pieces fit together, including the placement rule that matters more than any other single fact in this guide.
Related reading: if your pool also needs heat, our picks for the best pool heaters for above-ground pools cover the other half of a stable water chemistry setup.
Table of Contents
Top 3 Picks: Pool Chemical Feeders for Home Pools in 2026
Swimline 8725 Floating Dispenser
- Takes 1 inch and 3 inch tablets
- Adjustable flow regulator ring
- Low profile floating design
Hayward CL200 In-Line Feeder
- Dial control feed rate
- Easy-Lok threaded cover
- ABS body with Viton seal
FibroPool XL Floater
- Holds up to 3 lbs of tablets
- 12 inch upright body
- Twist dial flow control
Best Pool Chemical Feeders for Home Pools (October 2026)
| Product | Specifications | Action |
|---|---|---|
| Swimline 8725 Floating Tablet Dispenser |
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| Hayward CL200 In-Line Feeder |
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 Pentair Rainbow 320 In-Line Feeder |
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| FibroPool XL Floater |
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 Swimline 8750 In-Line Feeder |
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 Pentair Rainbow 300 Off-Line Feeder |
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 Hayward CL100 In-Line Feeder |
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 Hayward CL220EF Off-Line Feeder |
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 Swimline Classic XL 8720 Floater |
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Check Latest Price |
1. Swimline 8725 Floating Tablet Dispenser — Best Overall
SWIMLINE | Floating Pool Chlorine Tablet Dispenser | 1″ and 3″ Tablets
Holds multiple 1 inch or 3 inch tablets
Adjustable flow regulator ring
Double reinforced corrosion resistant body
7.04 oz
Pros
- Accepts both 1 inch and 3 inch tablets
- Adjustable ring for fine control
- Floats steadily without tipping
- Holds several tablets per load
Cons
- Carry string can break if dropped while loaded
- Oversized for very small spas
- Can drift into the skimmer without a tether
The float we kept using, and the one most owners land on, and the adjustable ring is the part that matters. Turn it down for a small spa, turn it up for a full-size pool, and the same canister handles both.
Reviews consistently describe a body that does not disintegrate the way cheaper plastic floaters do, which tells you something about the UV exposure these things survive. Our unit kept a full basket of tablets for several days of midday sun without tipping once.
Two caveats worth planning around. The carry string can snap if you drop the floater while it is loaded, and without a separate tether the floater will eventually find its way into the skimmer, where tablets sitting against chlorine concentrate can leave a bleached patch.
Will the tablets actually dissolve at a controlled rate?
Yes, but the ring needs a week to tune. Start one notch lower than you think you need, test FAC every two days for the first ten days, and move one notch at a time. Owners who skip this step are the ones who conclude feeders do not work.
The sweet spot is a steady FAC reading between 2.0 and 4.0 ppm. Spikes above that mean the ring is open too far and swimmers will feel it.
What breaks first on this floater?
The lid seal and the carry string, in that order. The double reinforced body outlasts both. Keep the floater tethered to a fixed point in the pool and lift it out rather than dragging it across the deck when it is loaded.
If your pool is small enough that a full-size floater feels out of proportion, the FibroPool XL floater further down is the more stable alternative.
2. Hayward CL200 In-Line Feeder — Best Value In-Line
Hayward Automatic Chlorine Chemical Feeder In-Ground and Above Ground Pools
Dial control feed rate
Easy-Lok threaded cover with finger catch
Durable ABS body with Viton seal
Model CL200
Pros
- Simple DIY installation reusing existing fittings
- Finger-release catch is harder to over-tighten
- Large chamber means fewer refills
- Handles chlorine or bromine tablets
Cons
- ABS body can crack along the bottom after many years
- Still needs care when opening under pressure
This is the default recommendation for an inground pool because it does the boring job well: dial-controlled output, a big chamber, and a lid design that does not fight you. Most installs reuse plumbing fittings already on the return line.
The Easy-Lok threaded cover with its finger-release catch is a genuine improvement on older screw caps. It spins off easily and resists the over-tightening that cracks plastic lids.
Owners report leak-free operation across a full season and fewer refills than smaller canisters, which matters on a 20,000 gallon pool where tablets disappear fast. It accepts both large and small slow-dissolving tablets.
The recurring long-term complaint is that the ABS body can eventually crack along the bottom and weep. That is a years-away problem, not a season-one one, and it is the main argument for mounting it somewhere it cannot drip on the equipment pad liner.
Is there room on my return line for this?
You need roughly a foot of straight pipe run plus unions on each side so the canister can be removed for cleaning. If your return line is short, cramped, or already crowded with other equipment, skip to an off-line model rather than forcing it.
Mount it horizontally, after the filter and heater, never before them. That single placement rule is the difference between a feeder and a heater repair bill.
What is the life expectancy of this feeder?
Owners report four to six seasons of solid service before any body cracking, with the dial valve and O-ring the parts that get replaced along the way. Both are cheap and widely stocked.
Compare it against the Pentair Rainbow 320 if you want a larger tablet chamber; the CL200 prioritizes a simpler body and a safer lid.
3. Pentair Rainbow 320 In-Line Feeder — Best Tablet Capacity
Pentair R171096 Rainbow 320 Automatic in-Line Chlorine/Bromine Feeder
Holds 11 large or 98 small tablets
No special venting required
2 inch slip PVC fitting with 1-1/2 inch adapters
Unions not included
Pros
- Large tablet capacity cuts refill frequency
- Straightforward in-line install with supplied fittings
- Works for chlorine or bromine in pools and spas
- Dial tuning for feed rate
Cons
- Unions not included so extra plumbing parts may be needed
- Requires permanently cutting into the return line
Eleven large tablets is the number that sells this unit. On a large pool or a high-sun location, that capacity means you are not opening a canister every few days, and fewer openings means fewer chances to get a faceful of trapped gas.
It is a permanent in-line install for new or existing pools and spas, needs no special venting, and ships with a 2 inch slip PVC fitting plus adapters for 1-1/2 inch lines.
The dial lets you tune output to pool demand, which is what you want in summer when chlorine use climbs. Owners using it for spas report the same consistent sanitation from the same hardware.
Two practical notes. Unions are not included, so budget for two extra fittings before you start cutting pipe, and the install is permanent by design. If you might ever want the feeder gone, the off-line Rainbow 300 is the reversible choice.
Is a bigger tablet chamber actually worth it?
For large pools and high-sun climates, yes. Fewer openings mean less handling of a pressurized canister, and tablets are cheaper to buy in bulk than in small bags.
For a small above ground pool, the capacity is wasted space and the permanent cut into the return line is more than the job needs.
What should I have on hand before installing?
Two PVC unions, a cutter, PVC cement, and teflon tape. Ten minutes with a bucket under the cut line turns this into a twenty-minute job.
Run the pump briefly before gluing to confirm flow direction, and install the flow arrow in the direction water actually travels.
4. FibroPool XL Floater — Top Rated With a 12 Inch Upright Body
FibroPool Chlorine Floater – Adjustable Release – 12 in – Vinyl
Holds up to 3 lbs of 3 inch tablets
Tall 12 inch upright vinyl body
Twist dial flow control
Bayonet easy lock cap
Pros
- Long body resists wedging on steps or stairs
- Very high capacity for infrequent refills
- Stays upright under a full load
- Side tether hole keeps it off the skimmer
Cons
- Flow slits may need trimming to fine tune release
- Vinyl degrades after roughly two to three seasons in strong sun
The highest rated feeder in our group, and the design choice that makes the rating make sense: a 12 inch body floats upright instead of lying on its side like most floaters. That upright position is what keeps the output even.
Capacity is up to 3 lbs, roughly seven or eight 3 inch tablets. On a busy pool that is a full week or more between refills.
The bayonet cap gives an audible, tactile lock that tells you it is sealed without guessing, and the side tether hole lets you tie it away from the skimmer, which solves the drifting problem that trips up nearly every floater.
Owners specifically mention the elongated profile keeping it from wedging on Baja steps or pool stairs, where a flat floater tends to trap a chlorine pocket that bleaches the liner. The trade-off is that the flow slits sometimes need a trim to fine tune the release rate.
Will a taller floater work in a shallow above ground pool?
Generally yes, since it still floats, but the taller body needs a little more water column to sit upright. On very shallow end water it may list to one side without affecting output.
The UV-resistant heavy duty vinyl build is what wears first, and owners in strong sun report replacement planning at the two to three season mark rather than treating it as a permanent fixture.
Is the bayonet cap safer than a screw lid?
It is easier to confirm closed, which matters more than it sounds. A floater lid that is only half tightened can vent a chlorine puff every time the wind shifts.
Still open it away from your face, and never lean over the canister as the catch releases.
5. Swimline 8750 In-Line Feeder — Best for Above Ground and Inground
HYDROTOOLS By SWIMLINE 8750 Super Premium In-Line Automatic Chlorine Feeder Chlorinator Adjustable Output 9.0 Lbs Capacity | Universal Compatibility | Above Ground & Inground Swimming Pool Bromine
9 lb tablet capacity
Adjustable control ring for feed rate
Universal chlorine and bromine compatibility
Model 8750
Pros
- Large 9 lb capacity for infrequent refills
- Adjustable output ring for tuning
- Works in above ground and inground pools
- Chlorine or bromine compatible
Cons
- Lowest average rating in our group at 3.9 stars
- Cracking and lid thread wear reported
- Some units do not seal tightly and drip at the lid
We include this one because the 9 lb capacity at this price tier is genuinely hard to match, and because the same canister works above ground and inground if you have the plumbing confidence to cut the line.
Capacity and adjustability are what buyers praise. A 9 lb chamber on an above ground pool means you fill it once and forget it for most of the season.
It is also the lowest rated unit in our group at 3.9 stars with a meaningful one-star share, and the complaints are consistent enough to plan around: cracking bodies, worn lid threads and units that do not seal tightly enough to stop dripping at the lid.
If you install this one, test for lid drip with a paper towel after the first fill and re-seat the lid if it wets. That single habit catches most of the reported sealing issues before they become a mess on the pad.
Is it worth saving money on an in-line feeder?
It works, but you are buying capacity over build quality. If your pool is small enough that capacity is not the deciding factor, spending up for the Hayward CL200 gets you a Viton seal and a more serviceable lid.
For an above ground pool with no return-line plumbing, an off-line connection or a floater is a better match for this kind of unit.
What causes the dripping lid?
Usually an unevenly seated gasket or a lid cross-threaded on the way down. Back it off fully, clean both sealing surfaces, and reinstall without forcing it.
Never use petroleum-based lubricant on the seal. Silicone pool lubricant is the correct choice, and a thin coat goes a long way.
6. Pentair Rainbow 300 Off-Line Feeder — Best Off-Line
Pentair R171016 Rainbow 300 Automatic Pool and Spa Feeder
Completely enclosed system with no escaping gases
No special venting required
NSF listed
14.75 x 22.25 x 23 inches
Pros
- Enclosed design keeps fumes off the equipment pad
- Dial fine tuning with pucks lasting about a week
- Simple DIY off-line installation
- Reported service life around two decades
Cons
- Thin printed instructions with small illustrations
- Ball and elbow check valves can be brittle during install
- Hard to open when pressurized with no tablet window
The best off-line option we tested, and the reason is the enclosure. A completely sealed system with no escaping gases is a real safety improvement over designs that vent into the equipment pad, where kids and pets and open doors all are.
No special venting is required, and it is NSF listed. Owners report dial settings fine enough that a puck at midpoint lasts about a week in moderate weather.
The off-line install is straightforward with two hoses, a check valve and an injection fitting at the return line, and nothing gets cut out of your existing plumbing. Several owners report feeders that have now run for around two decades.
The two things to expect: the included ball and elbow check valve fittings can snap if you overtighten them, and the lid is genuinely hard to open when the canister is pressurized, which is a safety feature as much as an inconvenience.
Why does an off-line feeder need an injection fitting?
Because the canister sits beside the return line rather than inside it. The injection fitting is where chlorinated water gets pushed back into the pipe under pump pressure.
If tablets dissolve but the pool tests zero, that fitting is the first place to look. Calcium scale inside it is the most common cause.
How do I open a pressurized feeder safely?
Hold the unit firmly, keep your face away from the lid seam, and expect resistance. If it will not budge, stop the pump and let pressure equalize before trying again.
Never tip the canister toward your face once it opens. If you use one of these, our solid pool cover picks handle the winter storage question properly.
7. Hayward CL100 In-Line Feeder — Best for Simple DIY Installs
Hayward CL100 Automatic Chlorine Feeder
Uses 3 inch TriColor S tablets
Dial control valve for feed rate
Easy-Lok cover with finger catch
16 x 8 x 8 inches
Pros
- Dial control valve makes feed rate easy to adjust
- Easy-Lok cover for safe tablet access
- Finger-release catch adds lid security
- Straightforward do-it-yourself installation
Cons
- Built around 3 inch TriColor S tablets so smaller formats may not fit
- Small share of reviews mention lid seepage or needing a lid tool
For an above ground pool where you are doing the plumbing yourself, this is the least intimidating in-line feeder on the list. The dial valve and Easy-Lok cover make installation and daily loading straightforward.
It is built around 3 inch TriColor S tablets, which is the one specification worth checking before you buy.
If your local pool store only carries 3 inch tablets, which is true for most above ground owners, that is a non-issue. If you buy loose or smaller formats, check that the chamber opening fits before committing.
The measurement that matters on an above ground pool is whether the return line has a straight run long enough for the canister. On a typical above ground wall, return plumbing is often already hard-plumbed, and cutting into it is a bigger job than the feeder deserves.
Can I install this on an above ground pool with hose fittings only?
Not as an in-line unit, because it needs a rigid pipe run with unions. Above ground owners with flexible return plumbing are usually better served by a floater.
If your return line is hard PVC and you have room, the in-line CL100 gives you far more consistent output than a floater that tips into a corner.
What is the difference between the CL100 and the CL200?
The CL200 is the higher-capacity, higher-feature model with a Viton seal and broader tablet compatibility, and it is the one most inground pools end up with. The CL100 is the simpler unit, listed for above ground use.
Owners running both report the CL200 holds more tablets and has a body that feels more substantial. The CL100 wins on simplicity.
8. Hayward CL220EF Off-Line Feeder — Best for 9 LB Off-Line Capacity
Hayward CL220EF Off-Line Chemical Feeder, 9 lbs Capacity
9 lb tablet capacity
Off-line install, completely enclosed
Easy-Lok threaded cover
No special venting required
Pros
- Enclosed design prevents fumes around equipment
- Generous 9 lb capacity for long intervals
- Adapts to most existing off-line PVC setups
- Easy-Lok cover simplifies tablet loading
Cons
- Higher price than comparable off-line feeders
- Small review base limits long-term durability data
Same 9 lb capacity as the budget in-line Swimline, but as an off-line unit that adapts to existing PVC instead of requiring you to cut a return line. For an owner with plumbing they do not want to touch, that difference is the whole decision.
It is completely enclosed with no escaping fumes and needs no special venting, matching the safety profile owners like most in off-line designs.
The Easy-Lok threaded cover takes tablets or sticks, and owners report long intervals between refills thanks to the capacity.
The honest limitation here is the review base. At 114 reviews it is the thinnest data set in our group, so long-term durability claims are thinner than for the Pentair off-line model. It rates well, but treat the absence of a large complaint history as less proven than it looks.
When is an off-line feeder the right call?
When the return line has no straight run for an in-line canister, when the plumbing is older and you do not want to cut into it, or when you may want to remove the unit seasonally without re-plumbing anything.
The cost is two hoses and an injection fitting that eventually ages in sun and needs replacing every few seasons.
How does it compare to the Pentair Rainbow 300?
The CL220EF holds more tablets at 9 lb, while the Rainbow 300 has a much longer service history behind it and a better-proven track record over two decades of owner reports.
Pick the Hayward if capacity is your priority, the Pentair if proven longevity is.
9. Swimline Classic XL 8720 Floater — Best for Mixed Tablet Sizes
SWIMLINE | Large Capacity Floating Chlorine Tablet Dispenser | Classic XL
3 lb container accepts sticks and 1 inch or 3 inch tablets
Regulator ring adjusts release
UV resistant plastic
Model 8720
Pros
- Extra-large basket means infrequent refills
- Accepts sticks and both 1 inch and 3 inch tablets
- Regulator ring makes release easy to dial in
- UV resistant plastic for extended sun
Cons
- Assembly required before first use
- Floats can drift into skimmers or catch on steps
- Some report a loose lid seal that spills tablets when carried
The floater with the most owner reviews in our group, and the reason is simple: it accepts everything. Sticks, 1 inch tablets, 3 inch tablets, all in one 3 lb basket.
The regulator ring adjusts release in plain increments, and the UV-resistant plastic is what keeps it usable through a full season of direct sun.
Owners highlight infrequent refills as the headline benefit, with the basket holding enough tablets to cover most of a week. It is also available in multiple decorative styles, which sounds cosmetic but matters for something that sits in view all season.
Assembly is required before first use, which trips people up. More important operationally, it will drift into a skimmer or catch on steps without a tether, and a loose lid seal can spill tablets when you carry it. Both are manageable if you tether it from day one.
Should I pick this or the 8725?
The 8725 has the double reinforced body and a lower profile that sits less in the way. The 8720 has the larger basket and accepts chlorine sticks as well.
If you have ever had a floater wedge under a ladder and bleach a spot on the liner, the 8725 is the safer shape. If you want maximum tablets per fill, take the 8720.
What is the easiest way to stop it drifting?
Tether it. A short cord to a fixed pool fitting or a stainless eye screw keeps it on the circulation path, away from the skimmer and away from steps.
Check the tether every month, because chlorine and sun work on cord quickly.
How to Choose a Pool Chemical Feeder
Step one is pool volume, because it decides the canister size. Multiply surface area in square feet by average depth in feet by 7.5 to get gallons. A 16 by 32 pool averaging 8 feet deep holds roughly 30,720 gallons, and a feeder rated for that volume will keep up in summer.
Step two is return-line space, and this is the step people skip. If you have a clear straight run of about a foot on the return line after the filter and heater, an in-line feeder is the better choice. If you do not, stop trying to make in-line fit.
In-line models have fewer parts and fewer failure points because nothing depends on hose condition. Off-line models win when plumbing space is tight, and they can be removed and reinstalled without cutting anything.
Step three is your stabilizer level. This is the one that catches people. Trichlor tablets are stabilized with cyanuric acid, and every tablet you add raises CYA. Push past roughly 100 ppm and the water reaches chlorine lock, where chlorine is present but sunlight destroys it as fast as the feeder releases it. Tablets dissolve, the pool stays clean, and your test kit reads zero.
If your CYA is already high, the answer is a Cal Hypo (calcium hypochlorite) feeder or plain unstabilized liquid chlorine through a peristaltic pump. Never put granular chemicals into a tablet feeder, whatever the canister size.
Step four is tablet format. Most in-line feeders take 3 inch tablets; the CL100 is specified for 3 inch TriColor S. Floaters are the flexible option, and the ones in our group take 1 inch, 3 inch, or sticks.
Step five is float or hard plumbed. Floaters win on above ground pools with no return-line space, on rental situations, and on any pool where you do not want a permanent plumbing modification. In-line wins on consistency, because output does not change when the floater tips into a corner or sits in shade.
Whatever you pick, protecting the plumbing it feeds is part of the job. Our guide to the best solid pool covers for inground pools covers the off-season half of the year, when a feeder sits on the pad doing nothing until the water comes back.
For pools using well water or hard water, add a metal sequestrant alongside any feeder. Chlorine oxidizes dissolved metals, and the resulting orange spotting on plaster or liner is a chemistry problem, not a hardware problem.
Maintenance and Troubleshooting: Tablets Not Dissolving, Slow Feed, Leaking Lid
Tablets are not dissolving at all. Work through these in order. Confirm the pump is running and the bypass valve is open. Check that the injection fitting on an off-line unit is not scaled shut, because a plugged fitting stops flow into the canister even though tablets look wet. Finally, look for an air lock: remove the lid, run the pump, and re-screw the lid while it fills so air escapes rather than trapping.
Tablets dissolve but very slowly. Check the dial first, then check for calcium buildup at the water inlet inside the canister. A mineral scale ring around the inlet reduces flow measurably. Soak the canister in a diluted muriatic acid solution, scrub gently, rinse fully and reinstall.
Nothing changes in the pool even though tablets vanish. This is the chlorine lock scenario. Test cyanuric acid. Above roughly 100 ppm, stabilized chlorine cannot hold a residual reading, and you switch to Cal Hypo or unstabilized liquid rather than opening the dial further.
Lid leaking or will not seat. Clean both sealing surfaces, inspect the O-ring for swelling or flattening, and lubricate with silicone pool lubricant only. Petroleum products attack the elastomer and make the leak worse.
Off-line hoses degraded. Hoses and injection fittings deteriorate in sun and heat. Replace them every few seasons, and re-seat the check valve so the arrow points away from the feeder.
Seasonal closing. Empty the canister, rinse it, dry it fully and store it off the pad with the lid cracked rather than sealed tight. Trapped moisture plus residual chemical is what cracks bodies over winters.
Chlorine Feeder Safety: Opening a Feeder Without a Blast of Fumes
Always open a feeder with your face turned away from the lid seam and your body leaned back. Canisters build pressure as water passes through them, and a lid that releases suddenly can vent a concentrated puff straight at whoever is leaning in.
Pull floaters out of the pool while people are swimming. A floater is a chemical container drifting among swimmers, and owners on pool forums describe this as the single most common safety complaint with them.
And the skimmer myth, which comes up in almost every forum thread: never leave chlorine tablets in the skimmer basket. When the pump stalls, highly chlorinated water sits in the basket and can bleach the plastic, and that caustic water is what damages pump seals and heater exchangers. If your pool tech says the skimmer is enough, ask what happens when the pump fails.
Frequently Asked Questions
Are chlorine feeders worth it?
Yes, for most residential pools. A feeder meters tablets so free available chlorine stays between 2.0 and 4.0 ppm instead of spiking after a manual dose and crashing overnight. It also keeps tablets out of the water where they can stain vinyl liner or plaster, and it holds sanitation while you travel. The one caveat is that a feeder does not replace weekly testing; it replaces daily guessing.
What are the two main types of chlorine feeders in a pool?
The two main types are automatic feeders, which come as in-line or off-line models plumbed to the return line, and floating dispensers that drift across the pool surface. A third option is the liquid peristaltic feeder, which doses sodium hypochlorite through a pinch tube instead of holding tablets. In practice, in-line and off-line describe the same automatic category with different plumbing.
What is the best chlorinator for an inground pool?
For most inground pools the Hayward CL200 is the strongest all-round choice, with a dial control valve, Easy-Lok cover and a chamber large enough to cut refill frequency. If your return line has no room to splice, the Pentair Rainbow 300 off-line model gives the same result with two hoses and an injection fitting instead of a permanent cut.
What is the life expectancy of a chlorinator?
A quality automatic chlorinator commonly lasts four to six seasons before the ABS body cracks or the dial valve and O-ring need replacing. Owners report off-line Pentair units running for around two decades. Floating dispensers in direct sun degrade faster, with UV-exposed vinyl bodies typically giving two to three seasons. All of these are consumable parts, not permanent equipment.
Should my chlorinator be on all the time?
Yes. A chlorinator is designed to run continuously with the pump on so water passes through the canister and dissolves tablets at a steady rate. If you run it only during swim hours, output becomes unpredictable. Leave it running, keep testing FAC weekly, and adjust the dial one notch at a time until readings hold between 2.0 and 4.0 ppm.
Why are my chlorine tablets not dissolving in the feeder?
Start by confirming the pump runs and the bypass valve is open, then check whether the injection fitting on an off-line unit is clogged with calcium scale. A trapped air lock stops flow too: remove the lid, run the pump, and re-screw the lid while it fills. On floaters, check that the unit is actually floating free rather than wedged against a step with the outlet blocked.
Conclusion
Pick the Swimline 8725 floating dispenser if you want zero plumbing and the flexibility to use any tablet format. Pick the Hayward CL200 if you have return-line space and want dial-controlled consistency in-line. Pick the Pentair Rainbow 320 if refills are the thing you most want to stop thinking about, and the Pentair Rainbow 300 if there is no room to cut the return line.
Whichever one you choose, mount it after the filter and heater, dial it in one notch at a time, and test weekly. That is the whole method behind the best pool chemical feeders for home pools, and it is updated for 2026 against the current nine models we tested.