Algaecide 60 Plus is broad spectrum ? Effective on yellow, the greenish free-floating varieties of algae and black algae that cling to the walls and bottoms of pools. Non-foaming ? Unlike the commonly used quaternary ammonium compounds, Algaecide 60 is specially formulated to be non-foaming even when added in high concentration slug doses, thereby enhancing pool appearance. pH tolerant ? Is effective in both acidic and alkaline pH ranges, thereby eliminating the need to alter pool chemistry prior to application. Non-metallic ? This product does not stain pool surfaces or swimmers? hair. No chlorine demand ? Can be used in pools treated with chlorine chemicals and its use may reduce the amount of chlorine chemicals normally required. Compatible with all sanitizers ? Is compatible with most chemicals commonly used to treat pools and hence can be used by all. Preventative & cure ? Prevents algae growth, eliminates existing algae in pools, and even prevents growth of most algae during the winter months when pools are not in use.