NATURAL BIOLOGICAL CULTURES - Bio Start contains biological cultures which, within hours, begin to set up the essential cycles that ensure pond water is safe for fish. Fish disease and death often result from poor pond water quality caused by fish waste building up to toxic levels CONSUMES FISH WASTE - each sachet contains 8,500 million bacteria to consume fish waste and help keep your pond clean and healthy KICK STARTS THE POND IN SPRING - great to use in spring to help kick start the pond out of its dormant state and give it a head start for the summer season KICK STARTS THE POND IN SPRING - great to use in spring to help kick start the pond out of its dormant state and give it a head start for the summer season HARMLESS TO FILTERS – this product is harmless to filters and all species of pond fish, plants and water using wildlife