Pure Pond Bomb is ideal to be used in koi ponds ornamental ponds self contained water features or ponds which do not have conventional filtration to achieve crystal clear healthy water. Inside the Pond Bomb there is a unique combination of friendly bacteria & enzymes which get to work as soon as the ball hits the water to clean up organic waste & break down the ammonia & nitrite to leave your pond crystal clear & healthy. The Pond Bomb can simply be dropped into the water or can be used when starting up a new filter as the bacteria will help remove the harmful bacteria & nitrite allowing the filter media to mature. The bomb just needs to be dropped into the biological stage of the filter.