Waterlife Algizin G clears green and cloudy water fast! This effective treatment resolves green water problems which can prove a major challenge for pond keepers throughout the Spring, Summer, Autumn. Algizin G works by flocculating the green water (clumping it together) and causing it to drop out of suspension. After Algizin G has achieved this, the algae is removed by the pump and filtration. Algizin G is safe with all pond fish and plants and will not damage filtration bacteria. Treatment may be repeated after 7 days if necessary or when the water shows signs of turning green again.