Evolution Aqua's Pure Pond Bomb is a concentrated version of their Pure Pond Treatment. With a new and improved activating gel the Pure Pond Bomb is a fast acting treatment that contains a unique combination of friendly bacteria and enzymes. As soon as this ball shaped bomb hits the water, this mix of harmless bacteria gets to work cleaning up organic waste and breaking down the ammonia and nitrite in the pond. This leaves the pond water crystal clear and healthy. The bomb is ideal for use in Koi ponds, ornamental ponds and self contained water features. The Pond Bomb can also be used when starting up a new filter, as the high concentration of bacteria will help to remove the harmful ammonia and nitrite, allowing the filter media to mature. Specifications1 Single Pack Bomb Simply drop the Pure Pond Bomb into your pond filter or directly into the water. Pure Pond Bomb can also be used when starting up a new filter, as the high concentration of bacteria will help to remove the harmful ammonia and nitrite, allowing the filter media to mature. Just drop the Pond Bomb into the biological stage of your filter. One Pond Bomb will treat ponds up to 20,000 litres.