Contains a highly concentrated special enzyme-based formula of selected natural bacteria which use organic waste as food that helps reduce the build-up of sludge and nutrients that algae use to grow, resulting in cleaner and clearer water. By reducing sludge, algae and debris it keeps pond maintenance to a minimum. Restores biological activity and helps to maintain a natural and healthy balance in pond water. It's safe for fish and plants if used in ponds with adequate aeration at recommended dosage rates.