Api Pond Sludge Destroyer promotes clean, clear pond water. Breaks down fish waste & dead algae. Consumes specific nutrients necessary for aldae growth & reduces pond maintenance. Sludge build up is unslightly & can reduce the oxygen concentration in pond water, creating a breeding ground for disease-causing bacteria. Sludge Destroyer is a super concentrated blend of beneficial bacteria that consumes organic pollution & increases the oxygen levels in pond water to create & maintain a healthy eco-system. Add 30ml per 1000litres of pond water. For a quicker clean up the dose can be doubled. Dose every two weeks to maintain a clear, clear pond. Safe for fish, pond plants as well as surrounding wildlife & pets.