Evolution Aqua's Pure Pond Bomb is a fast acting, concentrated version of Pure Pond Treatment. It is designed to achieve crystal clear, healthy water in garden ponds, Koi ponds, ornamental ponds, and self-contained water features, especially those without conventional filtration. The Pure Pond Bomb contains a unique combination of friendly bacteria and enzymes that work to clean up organic waste and break down harmful ammonia and nitrite in the water. It is safe for all ornamental fish ponds. One Pure Pond Bomb can treat ponds up to 20,000 litres. It can also be used when starting up a new filter to help mature the filter media.