King Technology Above Ground Pool In-Line Chlorine Chemical Feeder - up to 20, 000 Gallons Sanitizes up to 20,000 gallons Holds up to 7 pounds of chlorine or bromine NSF-approved with ergonomic built-in lid removal tool In-Line feeder requires 1.5 inch threaded PVC or filter hose Performance valve allows you to set chemical output to your specific needs