Applied Biochemists Algaecide Silvertrine 1 Quart P/N: 403303A Silvertrine algaecide: Eliminates tough black & mustard algae. Odorless and non-foaming. Features: Will not damage tile, concrete, metal or plastics Improves filter operation Tasteless, odorless and non-foaming at pool concentration and may reduce other chemical usage Applications: Normal: See product label for complete application instructions and dosages. Sizes: 32 oz. Compatible With: Chlorine and bromine sanitizers.