InLine Hayward Chlorinator


MANUFACTURERHayward Pool Products

  (4.7 out of 5 Stars on 43 Ratings)

resources:   Q&A: Ask a Question  | Q&A: View Answers (17) | Reviews (37) | Documents (1) | Parts (1) | How To's (3)

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Product Desciption

The CL200 Inline Chlorinator is designed to automatically feed chlorine to your inground pool by working with your existing pump and filter system.  Returning water to the pool flows through the chlorinator which is plumbed inline after the filter.  A simple dial valve allows you to easily control the amount of chlorine being dispensed.  No more floating chlorine dispensers in the pool or manually adding chlorine.  The CL200 sanitizes your pool automatically, holding 9 lbs of Trichlor tablets or sticks.  Hayward chlorinators are made from sturdy ABS thermoplastic and feature a durable Viton seal for the lid.


  • Holds 9 lbs of chlorine
  • Can be used with small or large slow-dissolve chlorine tablets or sticks
  • Dial control valve lets you adjust the rate of feed with 9 settings from "off" to "full"
  • Easy-Lok™ threaded cover offers safe and convenient access for adding tablets or sticks
  • Unique finger-release catch provides extra security
  • Includes mounting base
  • Easy installation for do-it-yourselfers
  • 1 year warranty
  • Please note: Unions are sold separately. If you do not have unions from a pre-existing CL200, you can purchase the UnionConnector Kit.


  • Pipe Size: 1-1/2 in.
  • Dimensions: (W) 9 in. x (H) 14-3/4 in.
  • Weight: 45 lbs.

Flow Ratings: (GPM = Gallons Per Minute)
CL100 - Used with pumps with flow rating of 30-50 GPM
CL200 - Used with pumps with flow rating of 50-80 GPM
CL2002S - Used with pumps with flow rating of 50-90 GPM
CL110 - Used with pumps with flow rating of 30-50 GPM
CL220 - Used with pumps with flow rating of 50-90 GPM

Miscellaneous Notes

Note:Chemical feeders should always be installed after a pool heater.

CAUTION: Extreme care must be excerised when adding chemicals to your pool. Concentrated chemicals may react violently if they mix in the chemical feeder, causing a fire or explosion, which may result in PROPERTY DAMAGE, PERSONAL INJURY or DEATH.

CAUTION: Never use any petroleum based lubricants on cover O-Ring. Regular lubrication is necessary to allow for easy cover removal. Use non-petroleum based lubricants such as Jack's No. 327 lube or Ivory bar soap.

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Ask a Question

Asked on 05/04/2015 by

I have a pump that has MAXIMUM CAPACITY (at 35' Head): 86 GPM FLOW AT 50' HEAD: 60 GPM with 1 1/2 pipe size pipe. Is this the correct model for me?

Inyo Answer

Answered on 05/04/2015 by Product Specialist Patrick P.

I would recommend the Rainbow 320 Chlorinator as it has much less flow restriction than the Hayward CL200 chlorinator.


Asked on 04/23/2015 by Kathy Money

I have an 18x36 in-ground chlorine pool with an inline chlorinator that was installed when pool was constructed in 1997. Haywayd system, screw off lid with drop in tablets. Dial it in and leave it. I still do the weekly check and treatments if necessary but my question is: I have been told that an inline chlorinator can only be used on saltwater pools. Please respond with information.

Inyo Answer

Answered on 04/23/2015 by Product Specialist Lennox H.

Kathy, In-line chlorinator are made for customers who uses chlorine tablets to chlorinate their pool. Saltwater pool wouldn't need an in-line chlorinator because the chlorine is generated with a saltwater system.


Asked on 04/10/2015 by

Have 2 inch piping through whole system with water features. 55 gpm pump, cartridge filter. Would putting this in create a restriction dropping to 1 1/2 pipe? Would I be better off with a off line? I'm replacing a pentair salt chlorinator and did not know if would be same unions. Can you give thread dimensions? Thank you in advance.

Inyo Answer

Answered on 04/13/2015 by Product Specialist Patrick P.

Yes putting the Hayward CL200 on 2" plumbing would cause a bit of a flow restriction as if you look through the 1-1/2" port it actually bottle-necks down to about 3/4" at its narrowest point. The offline version does have some issues with the tubes getting clogged. I would suggest the Rainbow 320 Inline chlorinator as it is a straight 2" port and has minimal to no flow restriction on 2" plumbing.


Asked on 03/15/2015 by Bruce

I am putting in a small in ground fiberglass pool, +/- 2500 gals and I am installing a 40 watt uv sanitizer and an ionizer. I understand I will still need to add a small amount of chlorine, equivalent to tap water. Is the lowest setting low enough for this application?

Inyo Answer

Answered on 03/16/2015 by Product Specialist Robert M.

Bruce - The CL200 , set on the lowest setting, may produce too much chlorine for your application. We would recommend the Rainbow 320. The 320 has the option to add a spa chamber which allows you to lower the chlorine output by using smaller tabs.


Asked on 02/01/2015 by John

I have a 33ft round above ground pool (27,500 gal) with flex hoses. Will this work or do you recommend something else?

Inyo Answer

Answered on 02/02/2015 by Product Specialist Robert M.

Hello John - The CL200 will work on your pool. We would recommend purchasing two adapters for the flex hoses.


Asked on 12/23/2014 by mike

Can you use Cal hypo tablets in this clorinator if inside pool(Cl-200)

Inyo Answer

Answered on 12/23/2014 by Product Specialist Alex V.

Mike, Unfortunately you can not use cal-hypo tablets in this chlorinator. It is designed for sloq dissolve tablets only.


Asked on 09/26/2014 by Guest

I have a Hayward inline chlorinator now and for approx 10 years. For the past 4-5 years we have difficulty unscrewing the top off to add the chlorine and to the point i can no longer add the chlorine myself. I need to ask someone else to do it and it is difficult for them as well. We would like to replace the chlorinator but afraid to get this same model with a screw top as we may have the same difficulty. Does Hayward sell a latch-on type lid rather than a screw-on type?

Inyo Answer

Answered on 09/26/2014 by Product Specialist Patrick P.

Unfortunately Hayward has not changed the design. The best way to prevent this from recurring is to keep the lid o-ring lubricated and to use the lid wrench - Part number 0211-0 or click on this link -


Asked on 09/19/2014 by Guest

I am thinking of purchasing a chlorinator, I use flex hoses right now. Will I have to change to solid piping?

Inyo Answer

Answered on 09/19/2014 by Product Specialist Patrick P.

You can use flex pvc or hose to plumb in the chlorinator. Keep in mind that both will deteriorate at a faster pace vs hard pvc and will need to be replaced eventually.


Asked on 09/12/2014 by Guest

Does this model work for above ground pools?

Inyo Answer

Answered on 09/12/2014 by Product Specialist Patrick P.

The CL200 will work well with an above ground pool if the plumbing is hard pvc. We offer the NA342 for above ground pools with flexible plumbing.


Asked on 08/15/2012 by Guest

Does the Hayward CL200 need an external check valve?

Inyo Answer

Answered on 08/15/2012 by Product Specialist Patrick P.

Generally, yes, It is a good practice to keep the water with high concentrations of chlorine from backing up into your heater or filter.


Asked on 08/06/2012 by Guest

I have a really hard time taking the cap off my chlorinator. Is there a wrench that I can buy?

Inyo Answer

Answered on 08/06/2012 by Product Specialist Patrick P.

If you are having difficulty removing the lid on your Hayward CL200 or CL220, you can the Dura Grip Lid Wrench: It fits securely on the lid, making removal a breeze.  


Asked on 01/30/2012 by Guest

What is the difference between an inline and offline chlorinator?

Inyo Answer

Answered on 01/30/2012 by Product Specialist Patrick P.

An inline chlorinator would be plumbed directly inline with the plumbing.  For an existing pool, this would mean a section of pipe would need to be cut out to install the chlorinator.  An offline chlorinator attaches to existing plumbing by chlorinator tubing (holes would be drilled into existing pipe to attach the tubing.)


Asked on 11/21/2007 by Guest

How do I know if one chlorinator is enough for my pool?

Inyo Answer

Answered on 11/21/2007 by Product Specialist Patrick P.

The Hayward CL200 or CL220 chlorinator will provide enough chlorine for up to 40,000 gallons of water.  You would need to calculate the volume of your pool to determine how many chlorinators you would need.  For example, if you have 60,000 gallons then you would use two CL200 or CL220 chlorinators.


Asked on 04/02/2007 by Guest

Does the in-line chlorinator come with a check valve, or must it be purchased separately?

Inyo Answer

Answered on 04/02/2007 by Product Specialist Patrick P.

No this does not come with the check valve. We would highly reccommend purchasing one of the check valves listed on this page 


Asked on 03/10/2007 by Guest

Is there a feedback mechanism that tells the unit the chlorine balance in the pool? Is this a way for me to automate addition of clorine to keep it always at the correct level? Or, just another place to put the tab aside from the the drain basket?

Inyo Answer

Answered on 03/10/2007 by Product Specialist Patrick P.

There is a dial on this unit which has a setting from 1-10 If you set the dial on 1 it will be letting the least amount of chlorine to the pool and if you have it set at 10 this would send the most amount of chlorine to the pool. So you can automate the feed of chlorine to the pool but you will still need to manually test your water. We do not recommend placing tablets in the skimmer basket because this high concentration of chlorine goes directly back to your pump and can cause corrosion to your pool equipment. If you do not go with the automatic chlorinator we would recommend at least going with one of our floating chlorinators so you do not damage your equipment you may view our floating chlorinators here 


Asked on 07/13/2006 by Guest

Can I use granular, or must I use 3" tablets or stick?

Inyo Answer

Answered on 07/13/2006 by Product Specialist Patrick P.

We recommend using tablets or sticks, and not to use granular with chlorinators.


Asked on 06/20/2006 by Guest

Does this model work with 1 1/2" PVC?

Inyo Answer

Answered on 06/20/2006 by Product Specialist Patrick P.

Yes this is made for 1 1/2" PVC pipe.

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Ratings Summary

Average Rating:   (4.7 out of 5 Stars)

Recommended: (93%) 40 of 43 customers would recommend this product to a friend.

43 Ratings 5 star:   (31) 4 star:   (11) 3 star:   (1) 2 star: (0) 1 star: (0)

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The Most Helpful Review

3 of 4 people found the following review helpful:

   (5 out of 5 Stars) Great Chlorinator

Reviewed By: from Enterprise, AL ()

Pros: Makes keeping the chlorine level in your pool easy and trouble free.

Cons: You must be careful when putting tablets in the chlorinator as the chlorine smell is very strong.

This CL200 Hayward chlorinator was a replacement for my 12 year old Chlorinator, which I cracked by accident. The new chlorinator works very well and is a duplicate of the old one, but shinier. Works well, lasts a long time. Get the union kit to ease installation now and in the future.

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The Most Recent Reviews

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   (5 out of 5 Stars) Good Chlorinator

Reviewed By: from New Haven In ()

Installed easily and simple to use.

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   (5 out of 5 Stars) hayward chlorinator

Reviewed By: ()

Pros: holds a lot of chlorine,works great

Cons: no cons

bought it to replace 12 year old one lasted 12 years works great old one still works but needs more $ in parts so I bought another

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   (5 out of 5 Stars) Hayward Chlorinator

Reviewed By: ()

Pros: keeps chlorine level consistent

Cons: none

good buy makes my pool more maintenance free!

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   (5 out of 5 Stars) Great Purchase

Reviewed By: from Davie, FL ()

Pros: Easy Installation, Good Price

Cons: None

This was a first time replacement and I have to say it was very easy to install. It took about 30 minutes and has been working perfect ever since. Would definitely buy again.

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0 of 1 person found the following review helpful:

   (4 out of 5 Stars) hayward inline chlorinator

Reviewed By: from NJ ()

Pros: reliable long lasting unit

Got this at a better price than I could find elsewhere. Since I already had the same unit, I cheaped out and didn't buy the connecting pipes. Bad move. I can't get the old ones off. So currently I have the old unit installed with the new units top. Guess what, that solved my problem which was leaking and air in the pool return lines. A "tune up" kit is sold separately with O-rings for the top that probably would have solved my problem. Oh, well I'm going to order the connecting pipe and replace the unit as it is 15 yrs old anyway.

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   (4 out of 5 Stars)

Reviewed By: ()

Works great love that I don't have to feed the monster everyday. It's taken care of each time the filter runs.

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   (5 out of 5 Stars) Chlorinator

Reviewed By: from Merrick, New York ()

Pros: Perfect fit easy to install

Cons: None so far

The chlorinator was delivered very quickly, installed easily and has worked perfectly ever since.

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Hayward Chlorinator Manual (465.26 KB)

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