SeaKlear® 90265SKR 1 qt Bottle PhosKlear™ 4000 12 per Case. PhosKlear™ 4000 removes phosphates and keeps water clear. PhosKlear™ 4000 is more than just a powerful phosphate remover. It combines two SeaKlear technologies, SeaKlear Phosphate Remover and SeaKlear Chitosan Clarifier to quickly reduce phosphate levels and help clear pool water fast. Regular use controls phosphate levels and will leave your pool water looking beautiful and crystal clear.