King Technology 01015450 Pool Frog XL Pro Inground Feeder Chlorinator New Pool Frog XL 01015450 In Line Chemical Feeder for Inground Swimming Pools/Spas (Up to 40,000 gallons) Less work with no daily dosing. Reduces chlorine use up to 50%. Adopt an easier, more fun pool environment Patented mineral technology keeps your pH balanced by acting as a neutralizer