Aquascape Sludge Cleaner Bubble Tabs disperse sludge-eating bacteria quickly, helping maintain a strong biological balance in your pond while quickly cleaning rocks, gravel, and filter pads. Sludge Cleaner Bubble Tabs have over 500 million CFU bacteria count per tablet, allowing you to spend more time enjoying your water feature. Aquascape Sludge Cleaner Bubble Tabs is completely safe for fish, plants, pets, and wildlife and can simply be tossed directly into the pond, providing a fun and easy way to add water treatments to your pond. Each tab will treat 100 gallons. Aquascape is passionate about the products we produce, providing unique products, designs, and features that stand above the competition.