How To Use a Pool Chlorinator

WRITTEN BY:  Inyo Pools

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This guide shows you how to recharge an automatic chlorine in-line feeder. Use caution when handling chlorine products and avoid breathing chlorine fumes.

Step by Step


Step 1

Your first step in refilling an automatic pool chlorinator is to turn off the pool pump. For maximum safety turn off the power at the circuit breaker to the pool pump.

Step 2

Turn the pool chlorinator control valve on the feeder to the OFF postion. and wait one minute to allow water and fumes to drain from the feeder

Step 3

Remove the pool chlorinator feeder cap by turning the cap counter-clockwise. When removing the cap, do not stand above the feeder and DO NOT INHALE the chlorine fumes rising from the open feeder. You may need a lever to help twist off the cap.

Step 4

Add two or three jumbo tablets to recharge the pool chlorinator feeder

Step 5

Lubricate the O-ring with a silicone lubricant and replace the pool chlorinator cap. Hand tighten only. Do not use a lever.

Step 6

Inspect line for kinks or wear each time the feeder is recharged. Replace line yearly if necessary.

Step 7

Turn the power to the pool pump back on.

Step 8

Reset the control valve dial to the level required to maintain 1-3 ppm of free and available chlorine in your pool. This will vary with pool use and weather conditions.


(1 to 29 of 29)

Inyopools  Posted: 08/21/2017 11:22 AM  Inyo Product Specialist

Anonymous (Chlorinator) - Check that the black hose around the chlorinator is not kinked and that the dial is set to a value greater than one.

Anonymous  Posted: 08/19/2017 12:51 PM 

Our chlorinator quit supplying chlorine to the pool. The water flows into the chlorinator but the pool has no chlorine. What should I check to find the problem?

Inyopools  Posted: 07/24/2017 14:46 PM  Inyo Product Specialist

Christopher - Yes, three tablets will produce a higher concentration of chlorine in the tube than one tablet. The chlorinated water that you meter out will have more chlorine in it.

Christopher  Posted: 07/23/2017 10:37 AM 

Does it make a difference in chlorine output, if you are only putting one tablet in the tube vs 3?

Inyopools  Posted: 07/20/2017 10:47 AM  Inyo Product Specialist

Pool Girl - For a 25,000-gallon pool, I would start the chlorinator at a high setting then back off if your chlorine level gets too high. If you are getting algae at the bottom of your pool, you may have a water circulation problem. I would get a suction pool cleaner to help circulation on the lower levels. You might also look at getting a bigger pump and filter.

Pool Girl  Posted: 07/17/2017 19:04 PM 

We just bought a house with a pool, so I am new to this. I am inquiring about the chlorinator. What should the chlorinator be set on for a 25,000 gallon in-ground pool? Also, what is the best product to coordinate with this to clear the algae that builds up on the bottom of the deep end?

Inyopools  Posted: 07/17/2017 12:10 PM  Inyo Product Specialist

Leo - Try lubricating the o-ring and threads with a silicone lubricant.

Leo  Posted: 07/14/2017 22:53 PM 

Why is it so hard to remove the cap to my Hayward CL 110 Off Line Feeder when I add my chlorine (3 inch tablets) I need to have my wife hold the Feeder with Giant Channel-Locks and then I turn the lid with all my might to get the lid open. I don't like the fact that the base spins around. D. Leo Hall in Boise, Idaho.

Inyopools  Posted: 06/17/2017 14:09 PM  Inyo Product Specialist

DFronz - No. The chlorinator only generates chlorine when water flows through it. The chlorinator should be the last unit in the return lines. Water does not flow through the return lines when it is in Baskwash mode or when the pump is off.

DFronz  Posted: 06/17/2017 9:58 AM 

Should the chlorinator valve be set to closed when the pump is off? Or when I am backwashing?? Thanks

Inyopools  Posted: 06/04/2017 19:15 PM  Inyo Product Specialist

Pam -Yes, you could use this chlorinator for an above ground pool but it is generally used with rigid pipe. You would need adaptors to go from the tubing out of your filter to the chlorinator and also from the chlorinator to the tubing going back to your pool.

Inyopools  Posted: 06/02/2017 11:16 AM  Inyo Product Specialist

Anonymous (CL settings) - Position "6" releases the most chlorine.

Pam  Posted: 06/02/2017 6:10 AM 

Can this system be used for and 18x33 above ground pool??

Anonymous  Posted: 05/31/2017 18:09 PM 

Number system 1 to 6 what number let's the most chlorine in 1 or 6?

Inyopools  Posted: 05/29/2017 18:31 PM  Inyo Product Specialist

Anonymous (Chlorinator) - The chlorinator works at both speeds but only produces half the chlorine at half speed since you only have half the water flow. Check that the hose between the chlorinator and piping is not kinked. If you have a large pool, you could run the pump at half speed for a longer time or you could add another chlorinator in line with the first.

Anonymous  Posted: 05/26/2017 18:56 PM 

Put in line unit is not providing enough chlorine to our pool. It is set to 5 and I have to shock weekly plus I added a floating chlorine dispenser. What is wrong. Have a dual speed pump. Does it only chlorininate on high soeed?

Inyopools  Posted: 05/10/2017 7:58 AM  Inyo Product Specialist

Sandro - You have to turn off the pump to add tablets to the chlorinator. The water in the chlorinator is under high pressure when the pump is operating.

Sandro  Posted: 05/10/2017 6:04 AM 

Can I open chlorinator and drop in tabs when pool filter is running or do I have to always turn filter off before this process? My pump loses prime when I turn filter on and off so I was wondering....

Inyopools  Posted: 11/10/2014 11:44 AM  Inyo Product Specialist

Anne - The water normally flows out of the Chlorinator when it is opened up. You do not have to fill the tube. It will fill during normal operation.

Anne  Posted: 11/07/2014 8:51 AM 

Hello my pool guy lft the cap loose and the water level dropped I am tightening the cap and there is a chloride tablet in the tube but no water is this correct or should I add water to the tube.

Inyopools  Posted: 01/04/2014 11:16 AM  Inyo Product Specialist

Steve Dondalski – The water should drain from the tube when you shut the control valve off. You may have a faulty control valve. Check that the hose coming off the control valve is not kinked.

Steve Dondalski  Posted: 12/30/2013 20:22 PM 

When I set the chlorine level to the off position, turn off the filter and wait for the minute, the water level in the tube does not lower when I open the cap. Could the check value be malfunctioning? Or am I doing something wrong? Thanks for the help.

martinr  Posted: 07/22/2013 11:53 AM 

I have a 700 or 1400 aqua pure chlorinator system the panel reads service with no other lights on and an error message of 110 that is not listed in the owners manual with the other error codes. I am sure it is a salt cell corrosion error i need a "step by step" to clean the salt cell.

Inyopools  Posted: 06/21/2013 15:43 PM  Inyo Product Specialist

Amber - If your chlorine level is continually low you may have to increase the chlorinator setting. Before you change the setting, however, make sure your pool is balanced. In particular make sure you pH and Stabilizer are within their ranges. If either of these are out of bounds, you will not be able to maintain proper chlorine level.

Amber  Posted: 06/21/2013 12:21 PM 

How do you know what speed to put it at? We have an 16x32 lazy L inground pool, and we just installed the chlorinator. We put it on 4 as recommended to start by the pool company and they said check back in a week to see if the 4-5 3" pucks were gone. I run the pump roughly 12 hours at night 7pm-7am (they recommended 24 hours would be best), and I am getting a low reading from test strips I use regarding the chlorine levels. Am I doing something incorrect or is this normal?

InyoPools  Posted: 01/20/2013 10:08 AM  Inyo Product Specialist

raiha - If you install a salt chlorine generator, it will replace your chlorinator. However, you will still have to shock your pool with chlorine occasionally with heavy use.

Anonymous  Posted: 01/16/2013 19:14 PM 

Do you use Chlorine and Sea Salt together in pool or just one or the other

Orion  Posted: 06/04/2012 15:44 PM 

Seems easy enough

gator22  Posted: 12/17/2011 18:14 PM 

Thanks for the great article very useful