Check the listing for details. Ultra Clear Sludge Digester 12 ounce. Condition: New. Listed at 19.00 USD. Eliminate pond sludge and pond muck. Eliminate sediment from fish & animal waste, decayed leaves and grass, and eliminate organic decay from dead fish & wildlife. Prevent oxygen depletion from unhealthy pond sludge during the spring & summer. UltraClear Sludge Digester contains a variety of bacteria that digest sludge. It includes a class of bacteria that is facultative that works in an aerobic or anaerobic zone. First, it must be emphasized that Sludge Digester (or any biological product) is capable of digesting organic sludge, but not inorganic material such as sand, silt, or clay. Organic sludge refers to sludge of biological origin, such as leaves, grass, animal droppings, and dead algae. Some natural bacteria have the ability to vigorously attack the basic building blocks of organic sludge, such as proteins, starches, fats, and cellulose. In fact, UltraClear Sludge Digester is super-enriched with these types of bacteria. Dose the pond with one ounce of Sludge Digester for every 1000 gallons of water Contains a variety of bacteria that digest sludge.Strong enough to prevent excess build-upGentle enough to avoid oxygen depletionYour pond remains crystal clear, and bottom sludge is kept to a minimum