Algaetrine Algaetrine Applied Biochemists Algaecide Algaetrine algaecide kills algae and prevents regrowth without requiring pool closing. A single treatment lasts up to 90 days! This triple-chelated copper formula helps prevent staining, too. Continue Search Chemicals by Brand Pool Chemicals Spa Chemicals See Also: Splash Alkalinity Plus Blue Phosphate Remover The Iron, Colbalt & Spot Etching Stuff