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. Hayward Chlorinator CL220 Features: 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 Hayward Chlorinator CL220 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 Hayward Chlorinator CL220 Miscellaneous Notes Note:Chemical feeders should always be installed after a pool