What is the PURE Pond Bomb? PURE Pond Bomb is a fast acting, concentrated version of the Award Winning PURE Pond. PURE Pond Bomb is ideal for use 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 PURE Pond Bomb there is a unique combination of friendly bacteria and enzymes, which get to work as soon as the ball hits the water to clean up organic waste and break down the ammonia and nitrite to leave your pond crystal clear and healthy. How to use the PURE Pond 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 PURE Pond Bomb into the biological stage of your filter.