Aquascape MAINTAIN Automatic Dosing System Water Treatment for Pond,  32 oz/946 ml | 96032 Specially formulated to eliminate sludge in ponds Contains sludge eating bacteria and enzyme Provides optimum water quality and clarity Will treat a 2,000 gallon pond for up to 30 days Ideal for use with the Aquascape Automatic Water Treatment Dosing System # 96030