SeaKlear 90-Day Algae Prevention & Remover, 1 QtBrand: SeaKlear Color: Blue Features: Reliable & Effective 90 days no algae guarantee (when used according to instructions in balanced pool water) Kills and prevents blue green, green, yellow and black algae Non foaming, non staining (when used according to instructions in balanced pool water) 11. 8% Copper Sulfate Pentahydrate; 3% Copper as elemental Effective against blue green, black and mustard algae Nonstaining formula Each treatment will last