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 Bomb hits the water to clean up organic waste and break down the ammonia and nitrite, leaving your pond crystal clear and healthy. One PURE Pond Bomb is effective on ponds up to 20,000 litres. Directions: Simply drop the PURE Pond Bomb into your pond filter or directly into the water as and when necessary. The bacteria and enzymes will react to clarity issues in your pond. You cannot overdose with the PURE Pond Bomb. When starting up a new filter, simply drop the PURE Pond Bomb into the biological stage of your filter. The high concentration of bacteria will help to remove the harmful ammonia and nitrite, allowing the filter media to mature.