BIO-DEX PHOSDR 55 gal Drum Phosphate Remover is formulated with the best natural ingredients that eliminate phosphates on contact and the water problems that high phosphate levels can create. Use it as part of your regular maintenance routine to help maintain ideal water conditions. Swimmers can re-enter the water right after application. Phosphate Remover is compatible with all types of sanitizing routines and filter media. Phosphate Remover is non-toxic and won't affect the chlorine levels in water.