Green Water is caused by a nutrient overload in your pond. If your pond is green like the illustation below, it can be treated quickly with Flocculant Plus. Flocculants are commonly used in water treatment plants to settle out particulates. Flocculant Plus works the same way by causing algae to clump. The clumped algae either drops to the bottom of the pond or is picked up by your filtration system. The most effective way to use this product is to clean your filter media freuently after application–thus removing it completely from you pond’s ecosystem.