Inline Hayward Chlorinator 4.2 lb Capacity - CL100



Part # CL100

By Hayward Pool Products



Part # CL100

Product Description

Automatic Chemical Feeders Efficient and maintenance-free, these durable, corrosion-proof auomatic chlorinators and brominators are ideal for new or existing pools or spas and work automatically with your pump and filter system.


  • Uses large or small slow dissolve tablets or sticks
  • Dial control valve lets you control and adjust the rate of feed
  • Easy-Lok™ threaded cover for safe and convenient access to add tablets or sticks
  • Unique finger-release catch provides extra security
  • Simple installation for do-it-yourselfers.
  • 1 year warranty
  • Please note: Unions are sold separately. If you do not have unions from a pre-existing CL100, you can purchase the Union Connector Kit.


  • Pipe Size: 1-1/2 in.
  • Dimensions: (W) 8-1/4 in. x (H) 15-1/4 in.
  • Weight: 30 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

Please note: the chlorinator pictured above is the Hayward CL200. The CL100 has a slightly different body style. For the CL100 diagram, click here.

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.

Click here for more Hayward Chlorinator


?     Asked on 4/8/2017 by Dennis staub

Do you sell the tool to remove the cap on this unit.

A     Answered on 4/10/2017 by Lennox H.

Hi, Dennis. Unfortunately, a lid wrench is not for this unit.

?     Asked on 3/7/2017 by Ken

I use bromine 1" tables. Can I use the CL100 from Hayward inline unit. My pool is at 18,000 gallons

A     Answered on 3/7/2017 by Megan C.

Yes, you can use bromine tablets in the Hayward CL100. It may be ideal to use a larger chemical feeder, based on the design flow rate of your pump. 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

?     Asked on 3/1/2017 by RONNIE


A     Answered on 3/1/2017 by Stacey M.

Hello Ronnie, Inline Hayward Chlorinator 4.2 lb Capacity - CL100 would work. For Pipe Size: 1-1/2 in. and Used with pumps with flow rating of 30-50 GPM. Please make sure to purchase your Hayward Union Kit (for use w/ CL100 and CL200 Feeders) - SP1500UNPAK2 since unions are sold separately.

?     Asked on 9/7/2016 by armando

I live in Colombia , i like to by it , can you sell me the chlorinator cl 100? thanks

A     Answered on 9/8/2016 by Scott W.

Were you wanting to know more about it or just wanting to buy it? If you're ready to buy then you can give us a call to place an order or purchase it off of our website.

?     Asked on 6/29/2016 by

On the CL100 chlorinator, the control knob pointer is ambiguous. Which is the end that points to the Hi or Low settings, the big end or the small end?

A     Answered on 7/4/2016 by Lennox H.

Hi, The bigger end indicates  the desired settings for the chlorinator.

?     Asked on 6/12/2016 by Dianne

I need the lid /cap for the chlorinator,do you just sell that?

A     Answered on 6/14/2016 by Patrick P.

Yes we do carry the Hayward CL100 Lid here.

?     Asked on 6/10/2016 by Steven

i'm trying to find and an automatic chlorine feeder for my above ground Intex pool rated at 4,000 gal, which has an intex sand filter and pump unit with all 1 1/2 flexible hoses, so could this install inline after the sand filter using the same hose connections that intex uses for their hoses? if not, then what chlorinator would work without it being installed off line since all my hoses are flexible 1 1/2" hoses and can not be drilled or attached to properly.

A     Answered on 6/19/2016 by Lennox H.

Hi Steven, The 4.2lb In Line Chemical Feeder is what is recommended to you with your system if you have a 1-1/2" thread port on your sand filter.

?     Asked on 4/14/2016 by Barry

does the chlorinator have to be installed at ground level or can I use the pipe to hold its weight just downstream from my filter?

A     Answered on 4/14/2016 by Hector F.

This chlorinator can be installed inline and not resting on the ground.

?     Asked on 8/25/2015 by Larry

I may have tightened the top to much and cannot get it off... is there a tool that fits the grooves on the top, to get it off?? Thanks!

A     Answered on 8/28/2015 by Lennox H.

Hi Larry, There is not a Lid Wrench for the CL100, but you can use a strap wrench to remove the lid.

?     Asked on 7/15/2015 by

can this be used on a 5000 gallon pool

A     Answered on 7/15/2015 by Hector F.

Yes this chlorinator can be used in a 5k gallon pool as long as there is the required 30-50 gallon per minute rating in your system..

?     Asked on 6/25/2015 by Jim

I set my dial at 1 but still seem to,get an awful amount of clorine. Do you sell a replacement dial?

A     Answered on 6/25/2015 by Hector F.

Yes the dial can be seen here. You can always use less chlorine tablets for the time being as well until the chlorine level lowers some.

?     Asked on 6/9/2015 by Sandy

Would this cap fit a 26 year old Haywood model 3000D?

A     Answered on 6/19/2015 by Wes B.

Hello Sandy, Please contact Hayward at (1-888)-Hayward. They would be able to decide if this lid will fit the older model you have.

?     Asked on 6/2/2015 by Christine Maietta

Do any of the Hatward clorinators have a clear window to see level of chlorine tablets???

A     Answered on 6/2/2015 by Joe S.

HI Christine Currenty do not have a Hayward model that has a clear top. However CMP has a model 25280100 • Holds (12) 3 in. tablets or 5lbs of 1in. tablets• Treat pools from 5,000 to 50,000 gallons• Clear lid for easy serviceability• 2 in. unions for quick-disconnect• Superior dial with 100% shut-off• Built in flow meter for easy adjustment• No external hoses• All piping is inside unit to eliminate leaks

?     Asked on 5/15/2015 by

My CL 100/200 Chlorinator is not chlorinating my pool; this is the 3rd year of operation. I remove it every winter. Is there there a cleaning process?

A     Answered on 5/15/2015 by Lennox H.

The safest way to clean out a chlorinatior is to boil some water and pour it down the chlorinatior. If that doesn't solve your problem the check valve may need to be replaced.

?     Asked on 4/18/2013 by Guest

What union connectors are needed for the Hayward Chlorinator model # CL100?

A     Answered on 4/18/2013 by Patrick P.

The union connectors kit need for Hayward Chlorinator model # CL100, is part # SP1500UNPAK2.

?     Asked on 8/15/2012 by Guest

After two normal seasons of operating fine, all of a sudden the inside of my Hayward 300 chlorinator is turning black. What could be the cause of this? And what could I do to fix this?

A     Answered on 8/15/2012 by Patrick P.

If the water feels slightly greasy to the touch, it could mean that the chlorinator has turned black due to an excess of iron and manganese in the water. I would suggest checking the composition of your water at your local pool store or supply company. They should be able to tell you whether or not the pH and total alkalinity are in balance with one another.

?     Asked on 8/15/2012 by Guest

Can you use bromine tablets in the Hayward CL100 Inline Chlorinator?

A     Answered on 8/15/2012 by Patrick P.

Yes, you can use bromine tablets in the Hayward CL100.

?     Asked on 1/30/2012 by Guest

What is the difference between an inline and offline chlorinator?

A     Answered on 1/30/2012 by 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 determine if the CL100 is the proper size chlorinator for my pool?

A     Answered on 11/21/2007 by Patrick P.

The Hayward CL100 or CL110 chlorinator will provide enough chlorine for up to 18,000 gallons of water.  If the volume of your pool is greater than this, you would need the CL200 or CL220 model which is for pools up to 40,000 gallons.  For pools above 40,000 gallons, you would use multiple chlorinators.  For example, if you have 60,000 gallons then you would use two CL200 or CL220 chlorinators.

?     Asked on 4/2/2007 by Guest

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

A     Answered on 4/2/2007 by 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 3/10/2007 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?

A     Answered on 3/10/2007 by 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 7/13/2006 by Guest

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

A     Answered on 7/13/2006 by Patrick P.

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


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