Check the listing for details. Pondworx Pond Bacteria - Concentrated & Formulated for Water Features - Safe .... Condition: New. Listed at 24.29 USD. Ornamental water gardens and ponds are enclosed ecosystems, sometimes factors like fish load, uneaten fish food, organics such as leaves, sludge and unwanted debris may disrupt the balance. Leaves, grass clippings, algae, uneaten fish food, fish waste, and decaying plants all contribute to build-up of sludge which is not only unsightly, but unhealthy, as it consumes oxygen. Once applied, Pondworx Bacteria will instantly get to work on muck and sludge Once applied, Pondworx Bacteria will instantly get to work on muck and sludge This concentrated formulated is designed for large ponds but also works great in water gardens, koi ponds and other water features and will not harm vegetation, fish or wildlife. Treated bodies of water may be used for recreation, fishing, and other activities immediately after applying. Pondworx Products are designed to work in conjunction with each other to provide best results to promote and help maintain an ideal ecosystem for your body of water