Tetra Pond Sludge Remover 250ml is a handy water treatment that helps to decompose organic mud that accumulates at the bottom of the pond. When this organic waste and mud settles on the bottom of the pond, it can become unsightly and could disrupt the biological balance of the water. Sludge Remover contains highly active bacteria as well as enzymes that quickly and effectively help to decompose the organic part of the mud. The treatment breaks down the sludge so it can be easily removed from the pond by a filter or manual cleaning tools. Using Sludge Remover ensures a cleaner pond and healthier water as well as prolongs cleaning intervals and keeps the pond cleaner for longer. The effects of the treatment can be seen immediately and will work for longer. It is advised to use this treatment in areas of high foliage and fish stocking. 250ml Treatment Treats 5000 Litres of Pond water. Add 50ml per 1000 Litres of pond water monthly using the dosing cap.