PacifiClear Algaecide 60 Plus Algae Control 60 Plus algaecide is effective on yellow algae, green free-floating varieties of algae, and black algae that cling to the walls and bottoms of pools. Specially formulated to be non-foaming even when added in high concentration slug doses, enhancing pool appearance. Effective in both acidic and alkaline pH ranges, eliminating the need to alter pool chemistry prior to application. Does not stain pool surfaces. For use in pools treated with chlorine chemicals, and may reduce the amount of chlorine chemicals normally required. Compatible with most chemicals commonly used to treat pools. Prevents algae growth, eliminates existing algae in pools, and prevents growth of most algae during the winter months when pool is not in use. Size 1 Qt., Form Liquid, Pkg Qty 1, Package Type Bottle