How To Install an In-Line Chlorinator

WRITTEN BY:  Inyo Pools

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Chlorinators allow you to add controlled amounts of chlorine into your pool. They are attached to the output pipe after the filter. To use, open the top of the mechanism, insert chlorine tablets, and then adjust the amount of the chlorine going into the pool. Typically, they are used in the summer when the pool is used more. There are two types of chlorinators: IN-LINE CHLORINATOR - is attached directly into the plumbing system and you cut out pieces of pipe and install the whole system. OFF-LINE CHLORINATOR - sits on a stand and has two hoses – INPUT and OUTPUT – that lead from the output pipe to the chlorinator. This is used when the plumbing system on your filter has minimal space. This guide shows you how to install a Powerclean Ultra in-line Chlorinator.

Step by Step


Step 1

Tools you will need: 1) Hacksaw 2) Felt Tipped Pen 3) PCV Glue

Step 2

Turn off electricity going to the pump motor via your fuse box, not just the timer. You don’t want the pump to turn on when you are doing this.

Step 3

Determine where you want to put the chlorinator. Freshly chlorinated water will reduce the life of both the filter and heater. ALWAYS put the chlorinator AFTER the filter and heater. Generally the chlorinator should be the last unit installed before going back to the pool.

Step 4

This system comes with fittings for 2” and 3” pipe. Determine what size you have and then put the Union Tailpiece together on both sides. Make sure the washer is seated properly and the fitting is tight.

Step 5

Position the assembly on the out-flow pipe after the filter and make a mark on each side of the fittings. Measure 3/4” in from the mark you just made and mark with felt pen. This is where we will cut the pipe. IMPORTANT: Make sure that the flow arrow is pointed in the right direction (towards the pool)

Step 6

Cut the pipe at the inside markings you just made.

Step 7

Gently pull back the pipes and insert the chlorinator to see if you have a good fit. Remove.

Step 8

Now put glue on the pipe, and on the inside of the chlorinator fittings. MAKE SURE THE FLOW ARROW IS POINTED IN THE RIGHT DIRECTION (towards the pool)

Step 9

Insert the chlorinator and hold straight up until the glue sets. Ideally, put a brick on one side of the chlorinator to support it.


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Inyopools  Posted: 08/05/2017 14:12 PM  Inyo Product Specialist

Doug - Because of the corrosive nature of the concentrated chlorine coming out of the chlorinator, it should always be installed after all other units. It should be the last unit before the returns to the pool.

Doug  Posted: 08/05/2017 12:34 PM 

Does it matter where the inline chlorinator is installed in relation to a heater and ozone/UV generator? The article says downstream from the filter. Does position of chlorinator in relation to these other 2 units matter? Thank you.

Inyopools  Posted: 04/18/2015 10:56 AM  Inyo Product Specialist

randa - The check valve would go between the heater or filter on the inlet side of the chlorinator. If you have limited room, you might consider installing an off-line chlorinator. See "How To Install a Pool Off-Line Chlorinator".

randa  Posted: 04/16/2015 17:47 PM 

I need an answer for the question about converting salt cell to inline chlorinator also. would like to place where cell was. also where to put check valve I have 13" between pipes

Inyopools  Posted: 04/08/2015 10:35 AM  Inyo Product Specialist

Chlorinator - You might consider putting in an off-line chlorinator. This only requires you to drill two holes in your piping which could be plugged later. See our guide on "How To Install a Pool Off-Line Chlorinator" for detailed instructions.

Anonymous  Posted: 04/07/2015 10:34 AM 

We have a salt system and are wanting to put in an inline chlorinator where the salt cell was. Is there a way to do it without having to cut any of the existing pipe? Incase we revert back to salt at some point.

Inyopools  Posted: 07/20/2014 16:38 PM  Inyo Product Specialist

Ted – I would recommend installing the chlorinator outside the pool house for safety.

Ted  Posted: 07/19/2014 4:36 AM 

Should the chlorinator be installed inside or outside of the pool house for safety?