All Ponds Rely On Biological Waste Breakdown Cycles To Keep Them Healthy. Bio-Start Helps To Rapidly Establish This Important Natural Process And So Reduces New Pond Syndrome. Can Be Added Directly Into The Pond Or Biological Filter. Also Use To Help Kickstart Biological Filters In Spring And Also To Boost Filtration When New Livestock Is Added. There Are 8500 Million Bacteria Per Sachet.