Pool Chlorinator – Best Automatic Chlorine Auto Dispenser For Pools (2020)

You have to keep your pool’s water clean and that could mean quite a bit of work.

It’s important to maintain the cleanliness of the water and automatic pool chlorinators can certainly help and diminish some of the pool maintenance you need to do.

Let’s take a look at exactly what this equipment does and how it can contribute to keeping the water in tip-top shape this season.

Pool Chlorinator

What is a Chlorinator?

It is an instrument that will apportion chlorine automatically.

This piece of equipment will substitute you in an important maintenance chore.

Normally, you would need to pour liquid chlorine directly into the water or you might use a floating pool chlorinator for the same reason.

Auto chlorinators only require you to pour chlorine into the reservoir, and the dispenser will do the rest.

You set the rate and the unit dispenses chlorine into the water.

This can save you time by reducing your work to simply adding the chlorine to the unit.

How does a Chlorinator Function in a Swimming Pool? Is it Automatic?

This device is directly plugged into the pool’s filter and pump system.

It sanitizes the water returning from the pump by dispensing chlorine externally.

Depending on whether you have an inground or above ground pool, you will need to verify if the device you purchase can be used with it.

Some models will be specific to either inground or above ground installations, while others can be used regardless of type.

Calculate First Your Pool’s Volume – Set Up The Automatic Chlorinator Later

There are models that can work with various sized pools. It is important to verify if the sanitizer you want to purchase is designed to handle your volume of pool water.

Many chlorinators are designed for larger pools, for example maybe 40,000 gallons or larger, and there are sanitizers specifically designers for smaller pools.

If you don’t know how many gallons of water you have, multiply the pool’s width by its length and you’ll have the surface area.

Now add the deepest depth to the shallowest depth and divide the total by two for the average depth.

To estimate the number of gallons of water, multiply the surface area by the average depth and then multiply the answer by 7.5.

You’ll have the approximate number of gallons of water.

Types of Chlorine Feeder

Chlorine sanitation uses four types of chlorine

  • gas
  • liquid
  • powder/granule
  • chlorine pucks/tablets

Chlorinators will most often use chlorine pucks/tablets that are dissolvable in the pool.

Inline Automatic Pool Chlorinator or Offline?

There are two options when shopping for a chlorine dispenser: inline and offline.

They function in the same manner and vary very little in terms of cost.

What defines an Inline Automatic Pool Chlorinator?

The installation is what characterizes the difference.

An inline unit will be installed in the piping that connects to the pump and filter.

An offline unit will be installed to the side of the system and connected to it by a tube.

Some units can function in both ways.

Is an Automatic Chemical Feeder the Same as an Automatic Pool Chlorinator?

Not exactly!

These two pieces of equipment are similar but not the same.

Chemical feeders can be used with either bromine or chlorine, while chlorinators are specifically for chlorine.

They also may use different sizes of tablets.

The Pros and Cons of Your Automatic Pool Chlorinator


  • Chlorine is not added instantly Functions automatically whether you’re home or not
  • Functions with concrete, fiberglass or vinyl liner pools
  • Functions with both inground and above ground pools
  • Inline and offline models available
  • Settings control how much chlorine to add and when


  • More costly than manual chlorination
  • Requires installation
  • Will require standard maintenance over time


What is an auto-chlorinator?

It is a device which dispenses chlorine directly into your pool.

How does a chlorinator work?

These devices plug directly into your pool’s pump, sanitizing the water that returns.

How much does a chlorinator cost?

Generally, auto chlorinators fall in a price range of $40 to $100.

The Bottom Line About Your Automatic Pool Chlorinator

A dispenser for chlorine is easy to use and requires only that you add chlorine pucks/chlorine tablets.

Aesthetically it can be a pleasant choice because it is installed beside the pump and filter as opposed to a floating chlorinator which adds hardware to the pool.

This also adds to the safety of the pool.

It will save you time and needs little maintenance.

It also contributes to the life of your filter system by reducing chlorine corrosion.

Finally, it will work while you’re away so you won’t return home to clean the water.