The Clean for Ponds autodoser pouch contains a powerful blend of Beneficial Bacteria that clears sludge between rocks and in filter pads. Use until sludge is cleared, then switch to the Maintain for Ponds autodoser pouch for preventative maintenance. Safe for fish, plants and pets when used as directed. One bag treats a 2,000-gallon pond for up to 30 days. Works with Aquascape Automatic Dosing systems.