Check the listing for details. Alpha BioSystems Sludge and Odor Remover Dry, 12oz. Condition: New. Listed at 34.99 USD. Remove sludge from your pond- without the use of toxic chemicals.All-natural treatment works great for:Naturally improving the balance of an aquatic eco-system by reducing or eliminating organic sludge buildup.Increasing pond water clarity.Getting rid of odors typically associated with sludge buildup.Sludge REMOVER consists of a special blend of beneficial bacteria.Naturally occurring microbes use nitrogen and phosphorous as a food source- eliminating excess nutrients that cause low-quality water problems.The microbes in Sludge REMOVER help improve pond and aquarium water clarity. Chemical free and non-toxic.Completely safe for aquatic life- won’t harm fish or other living beings.Sludge REMOVER has no odor and is not a chemical.Each ounce treats up to 1,250 gallons for initial use and 5,000 gallons for maintenance. Each pound treats up to 20,000 gallons for initial use and 80,000 gallons for maintenance.