Blagdon Pack of 4 Bio-Start Pond TreatmentEstablishing or boosting the levels of healthy bacteria in your pond environment Bio Start will help your biological filtration to cope with pond waste Simple to use Highly effective Perfect for when starting a new pond Bio Start contains biological cultures which within hours begin to set up the essential cycles that ensure pond water is safe for fish. Each sachet contains 8,500 million bacteria to consume fish waste. Fish disease and death often