Offline Hayward Chlorinator - CL110



Model # CL110

By Hayward Pool Products

  5 Average  



Model # CL110

Alternate Part #'s 42-150-1000, HAY-45-902, HAYCL110

Product Description

CL110 CHLORINATOR - 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  

Dimensions: (W) 6-3/4 x (H) 13 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

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.

?     Asked on 5/24/2022by Kathleen McGee

what is the difference between an offline and inline chemical feeder

A  Answered on 5/24/2022 by InyoPools Product Specialist Craig C.

Hello Kathleen. An inline chlorine feeder is installed directly into the pool circulation plumbing.   An offline chlorine feeder is connected to the pool circulation plumbing through a bypass line (inlet water supply, outlet chlorinated water).  Attached please find a brief tutorial How To Decide Whether You Need An In-line or Off-line Chlorinator  Please reference the diagrams, Steps 4 & 5, for the installation difference.

?     Asked on 3/16/2022by Larry

What is the capacity of the CL110? The CL220 is 9lbs.

A  Answered on 3/16/2022 by InyoPools Product Specialist Rich N.

Hi Larry, the Hayward Offline Hayward Chlorinator - CL110 holds 4.2 pounds of chlorine.  

?     Asked on 5/9/2020by matthew kline

Which offline chlorinator works for me? My pump motor is Pentair 340039 SuperFlo High Performance Single Speed Pool Pump, 1½ Horsepower, 115/230 Volt, 1 Phase Thanks Matt

A  Answered on 12/7/2020 by InyoPools Product Specialist Hector F.

Hi Matthew, as long as you have adequate flow through your system you can use this or any residential offline chlorinator. 

?     Asked on 7/1/2019by Matthew Foti

Does this unit only work with trichlor ?

A  Answered on 7/1/2019 by InyoPools Product Specialist Matt S.

Offline and inline chlorinators can use any type of chlorine r bromine tablets.

?     Asked on 6/7/2019by Bob Smith

What is meant by "offline"

A  Answered on 6/7/2019 by InyoPools Product Specialist Hector F.

The offline means that the unit does not actually have to be plumbed into the PVC. There are thin tubes that get attached to the plumbing from the chlorinator. 

?     Asked on 9/7/2018by Gary MacPherson

Hi...can bromine tablets be used in the Hayward CL110 chlorinator? Thanks

A  Answered on 9/7/2018 by InyoPools Product Specialist Lennox H.

Hi, Gary. Yes, this CL110 unit can be used with bromine. You will not be able to use chlorine with this unit once you've begin using bromine. 

?     Asked on 6/3/2018by Inyo Visitor

I have n 18x36 fiberglass pool that is 21,000gals. according to manufacture I have to keep chlorine at less than 1.0. if it get higher then I get a brown ring at the top edge of the pool. in order to remove I have to take floater out then when chlorine level drops put in 11/2 gal of Muratic acid to clear pool. will the Haywood CL110 put in low levels of chlorine to solve my issues ?

A  Answered on 6/3/2018 by InyoPools Product Specialist Hector F.

You may need to have a full chemistry test done to the pool water but yes one of the features of the CL110 is that a dial control valve lets you control and adjust the rate of feed.

?     Asked on 7/28/2017by Terry

I need the o-ring that goes into the feeder cap. I have a Hayward CL110ABG feeder but I don't know what the ABG means & don't know what the right replacement part is. Please help.

A  Answered on 7/29/2017 by InyoPools Product Specialist Lennox H.

Hi, Terry. The replacement cap o-ring for the CL110ABG unit is Item CLX110K. ABG means Above Ground.

?     Asked on 7/8/2017by Bob

if I have a 2hp pump and use an off line chlorinator, why can I not use the CL110 and control the amount of water entering the chlorinator to a low level.

A  Answered on 7/10/2017 by InyoPools Product Specialist Lennox H.

Hi, Bob. If you can reduce the flow rate to 30-50 GPM going into the chlorinator you can use the CL110 Chlorinator. 

?     Asked on 5/28/2017by Inyo Visitor

Is the check valve the outlet on the CL110? If so that goes between the filter and the return line back to the pool, correct?

A  Answered on 5/28/2017 by InyoPools Product Specialist Stacey M.

Hello, Your CL110 is just the chlorinator there is no check valve attached, just a dial on the chlorinator, these check valves are located here.

?     Asked on 5/2/2017by Robert Bytner

Can clamps for off line chlorinator be placed on flexible tubing or just PVC?

A  Answered on 5/2/2017 by InyoPools Product Specialist Stacey M.

Hello Robert, you can use the clamps on both, but PVC is preferable.

?     Asked on 3/1/2017by norm

could one of these chlorine add on units be used for a well water for a house? the water is pumped up and stored in a 1,000 liter tank before it's filtered and cleaned and fed to the house?? thank you very much. sincerely, Norm

A  Answered on 3/1/2017 by InyoPools Product Specialist Scott W.

Yes, you could use it for that purpose.

?     Asked on 6/15/2016by Lon

I have a Hayward SP2607X10 Super Pump 1-HP Max-Rated Single-Speed Pool Pump. The specs say with 50 feet of head (approximately the distance to farthest pool "jet") it's pushing out 40 GPM. Is the CL 110 sized correctly or do I need to go up to a CL 220?

A  Answered on 6/17/2016 by InyoPools Product Specialist Alan M.

I would recommend the CL220 or the CL200 depending on if you want the inline or offline version.

?     Asked on 6/1/2016by Gleb

When do you recommend to use inline system and when offline system.

A  Answered on 6/1/2016 by InyoPools Product Specialist Patrick P.

Hi Gleb, it really comes down to the question of whether or not you have room to place the chlorinator in-line with the rest of your equipment. In-line chlorinators are connected directly after the filter (or heater, if you have one) and should be the last piece of equipment before the water is returned back to the pool..

?     Asked on 3/4/2016by Irwin

where do the inlet and outlet hoses attach to the filter

A  Answered on 3/7/2016 by InyoPools Product Specialist Lennox H.

Hi Irwin, The inlet and outlet hoses do not attach to the filter, it's attached to the pvc line. Please reference the Hayward Automatic Chlorine Feeder Manual for installation instructions.

?     Asked on 9/8/2015by Inyo Visitor

what the difference between the c100 and c110

A  Answered on 9/9/2015 by InyoPools Product Specialist Joe S.

The CL100 is a Inline system, the CL110 is a offline system

?     Asked on 6/1/2015by mark bowden

I'm not getting chlorine in my pool due to the 3" Chlorine tablets aren't dissolving. It was working fine until the other day.. Please advise of possible troubleshooting checks to determine and fix the problem. I have the CL100 or 110. Not sure which one exactly.

A  Answered on 6/7/2015 by InyoPools Product Specialist Alex V.

Mark, If there is water inside of the chlorinator but you are not getting a chlorine reading, there may be blockage inside of the unit. You can try flushing the blockage with warm water. Please do so in a well ventilated area to avoid inhaling chlorine gas.

?     Asked on 5/25/2015by Pete Rodi

Can this replace model 300-29X

A  Answered on 5/25/2015 by InyoPools Product Specialist Patrick P.

Hi Pete, this chlorinator is considerably smaller than the 300-29X chlorinator. I would suggest replacing your current 300-29X chlorinator with another 300-29X chlorinator.

?     Asked on 5/20/2015by Inyo Visitor

how do you hook up chlorinator?

A  Answered on 5/20/2015 by InyoPools Product Specialist Lennox H.

The installation instructions can be found on pages 4-5 of the Hayward Automatic Chlorine Feeder Manual.

?     Asked on 1/30/2012by Guest

What is the difference between an inline and offline chlorinator?

A  Answered on 1/30/2012 by InyoPools 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 11/21/2007by Guest

How do I determine if the CL100 is the proper size chlorinator for my pool?

A  Answered on 11/21/2007 by InyoPools Product Specialist 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 3/10/2007by 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 InyoPools 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 7/13/2006by Guest

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

A  Answered on 7/13/2006 by InyoPools Product Specialist Patrick P.

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


Est. Repair Time

2 to 4 hrs

Tools Needed

Screwdriver, Nut Drivers, Electric drill.

Parts for old style chlorinator (EZ-Chlor) no longer available, so had to get a new chlorinator.

Written on 12/6/2016 by Guest

Spoke with Hayward personnel and they said a problem existed because part of the system downstream of the filter and heater utilized copper piping and their chlorinator was not compatible with metal piping. Down stream of the return valves was all pvc, so dug a hole there and routed outflow from the Hayward chlorinator to this location utilizing the provided saddle T. Seems to be working.

Were these instructions helpful? 


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