Response to 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.

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