Throughout the year ponds accumulate debris dead plant matter uneaten food fish waste and if left untouched this forms an unsightly unhealthy layer of sludge at the bottom of the pond. Sludge Busters unique blend of bacteria and enzymes break down this sludge leaving your pond with a clean bottom! The bacteria are species that use oxygen locked up in the sludge for their respiration preventing a lack of oxygen in the water for the pond fish and other water borne wildlife. Also can be added to filters to reduce maintenance. A liquid alternative to Sludge Buster. Treats 2273 Litres.