Aquascape® 30408 1 gal Sludge & Filter Cleaner Professional Grade. Aquascape Sludge & Filter Cleaner Professional Grade helps to maintain a strong biological balance in your pond while quickly cleaning rocks, gravel, and filter pads. Each bottle is packed full of five pure strains of heterotrophic bacteria and 25% more concentrated than the consumer equivalent, making it the ideal choice for discriminating pond professionals. Our Sludge & Filter Cleaner Professional Grade will effectively reduce fish waste and decaying organic plant material in ponds, allowing you to spend more time enjoying your water feature and less time maintaining it. A 4.5 billion CFU per ounce potency ensures consistently effective treatment, and the included marigold and humic acid help to improve the pond environment for fish. The included measuring cup and dosage guide make application simple and easy. One bottle contains 1 gallon of treatment and treats up to 96,000 gallons of water. This treatment is safe for fish, plants, pets, and wildlife.