Above Ground Pool Chlorinators | Royal Swimming Pools

An above ground pool chlorinator feeds chlorine into the water automatically, so sanitizer levels stay steady without daily hand dosing. The main decision is type: floating dispensers sit in the pool and need no installation, in-line and off-line feeders plumb into the return line for a controlled feed rate, and salt systems generate chlorine from dissolved salt instead of tablets. Match the unit to your water volume, since the models here are rated from roughly 5,000 up to 70,000 gallons. Chemical feeders are commonly installed alongside pumps and filters to ensure proper circulation through the feeder. Many pool owners also coordinate feeders with pool chemicals to fine-tune water balance. For pools using alternative sanitation methods, salt water systems are often considered as part of the setup.

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About Above Ground Pool Chlorinators

Chlorinator Types and How They Differ

A floating dispenser sits in the water and releases tablets as they dissolve, which makes it the simplest and least expensive option. In-line and off-line feeders both connect to the return line after the pump and filter, so chlorinated water flows into the pool rather than back through the equipment. An in-line unit is plumbed permanently into the return pipe, while an off-line unit sits beside the line and connects with tubing. Salt systems take a different approach and generate chlorine from dissolved salt rather than using tablets.

Matching a Chlorinator to Your Pool Volume

Feeders are rated by the water volume they can sanitize, and the models here cover roughly 5,000 to 70,000 gallons. Calculate your pool's volume first, then choose a unit rated at or slightly above that figure. An undersized feeder runs at full output and still falls behind during hot weather or heavy use, while a slightly oversized unit simply runs at a lower setting. The gallon capacity filter narrows the selection to units rated for your pool.

Tablets, Feed Rate, and Safe Handling

Most automatic chlorinators use slow dissolving 1 inch or 3 inch trichlor tablets, and a dial valve controls how quickly water passes through the canister. Start at a low setting, test the water after a day or two, then adjust from there rather than filling and forgetting. Never mix chlorine and bromine products, or different tablet types, in the same feeder, since concentrated chemicals can react violently inside the canister. Replacement cartridges for mineral and low chlorine systems are typically changed on a seasonal schedule.

If you are still comparing approaches, the above ground salt systems page covers chlorine generation without tablets, and above ground pool equipment covers the pumps, filters, and skimmers a feeder connects to.

Above Ground Pool Chlorinator FAQs

Can you put a chlorinator on an above ground pool?

Yes. Chlorinators are compatible with most above ground setups, and the main decision is how the unit connects. Floating dispensers need no plumbing at all, while in-line and off-line feeders tie into the return line after the pump and filter so chlorinated water flows into the pool rather than back through the equipment. Off-line models are often the easier retrofit, since they do not require a long straight run of return pipe.

What is the difference between an in-line and off-line chlorinator?

Both connect to the return line after the pump and filter, and both use a dial valve to control feed rate. An in-line chlorinator is plumbed permanently into the return pipe, which gives a clean install but requires enough straight pipe to fit the canister. An off-line chlorinator sits beside the plumbing and connects with tubing, making it the practical choice when the return run is short or already crowded.

Should I use a floating chlorine dispenser in an above ground pool?

Floating dispensers are popular because they are inexpensive and need no installation. The tradeoff is control, since they release chlorine as tablets dissolve rather than at a set rate, so levels drift with water temperature and swimmer load. They suit smaller pools and owners who test water regularly. If you would rather set a feed rate and check it weekly, an automatic feeder is the better fit.

What size chlorinator do I need for my above ground pool?

Chlorinators are rated by the water volume they can sanitize, and the models here span roughly 5,000 to 70,000 gallons. Work out your pool's volume first, then choose a unit rated at or slightly above that figure. An undersized feeder runs at full output and still falls behind in hot weather or heavy use. The gallon capacity filter on this page narrows the list to units rated for your pool.

What happens if you put too much chlorine in an above ground pool?

Excessive chlorine can cause skin and eye irritation and, over time, damage liners, seals, and other pool components. It usually comes from a feed rate set too high, or from running the feeder while also shocking the pool. If levels run high, turn the dial down, leave the cover off, and let sunlight break the chlorine down before swimming. Weekly testing is the simplest way to catch it early.

How often should I put chlorine in my above ground pool?

Test at least once a week, and more often during hot weather or heavy use, since heat and swimmer load both consume chlorine faster. With an automatic chlorinator you are refilling tablets rather than dosing daily, and a full canister commonly lasts a couple of weeks depending on feed rate and pool size. Adjust the dial based on test results rather than on a fixed schedule.

Are pool chlorinators worth it?

For most owners, yes. A chlorinator replaces daily hand dosing with a canister refill every week or two, and a steadier chlorine level does more to prevent algae than correcting after it appears. The equipment cost is modest against a season of chemicals and algae treatment. A floating dispenser delivers much of the convenience at a lower price if you are willing to monitor levels more closely.