Green Vista Oxy-Pond, Stream and Waterfall Cleaner - 5 Pound Container - Removes Algae Debris and Green Scum from Water and Surfaces - Uses Oxygen's Natural Power - Safe for Koi, Other Fish, Plants CLEANS NATURALLY, QUICKLY AND SAFELY: Green Vista Oxy-Pond Stream and Waterfall Cleaner uses oxygen's natural ability to remove algae debris from ponds, water gardens and other waterscapes. Its dissolvable granules clean rocks, surfaces, waterfalls, streams and anywhere else buildup occurs. LOWERS POND MAINTENANCE YEAR ROUND: Regular use of this cleaner helps to keep your water feature pristine during all seasons. It can eliminate the need for annual cleanouts, reducing maintenance. RESTORES NATURAL BALANCE IN WATERSCAPES: As it gets rid of greenish scum, this cleaner restores the natural electrolyte balance in water features. Providing a slight buffering effect, it prevents dangerous swings in pH levels. SAFE FOR FISH AND PLANTS: Koi, other kinds of fish and plants are safe with this cleaner used as directed. It contains no harmful detergents, surfactants or other chemicals. It is not for use with food fish. Applying the cleaner directly to plant leaves may discolor them slightly. APPLICATION TIPS: This cleaner is for closed system waterscapes. For the best results in such streams and waterfalls, shut off the pump during application of the cleaner, and turn on the pump directly after the application. Ensure the waterscape has a mechanical skimmer device, or remove excess debris and dead algae with a fine net the day after treatment. Retreat the waterscape after 48 hours if needed. A 5 pound container treats 800 square feet of water surface.