Aquascape Sludge & Filter Cleaner helps to maintain a strong biological balance in your pond while quickly cleaning rocks, gravel, and filter pads. Each bottle of Aquascape Sludge & Filter Cleaner is packed full of five pure strains of heterotrophic bacteria and is completely safe for fish, plants, pets, and wildlife. Sludge & Filter will effectively reduce fish waste and decaying organic plant material n your pond, allowing you to spend more time enjoying your water feature and less time maintaining it. Sludge & Filter contains a 1.5 billion CFU per ounce potency, ensuring consistently effective treatment and the included marigold and humic acid help to improve the pond environment for your fish. Aquascape is passionate about the products we produce, providing unique products, designs, and features that stand above the competition.