Api Pond Sludge Destroyer Promotes clean, clear pond water. Breaks down fish waste and dead algae. Consumes specific nutrients necessary for algae growth. Reduces pond maintenance. Sludge build-up is unsightly and 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 and increases the oxygen levels in pond water to create and maintain a healthy eco-system.