Display Pack of 6 x Purisol 300ml Bottle. PuriSol is a complete sanitiser and deodoriser of water storage tanks. Fill up the tank or container with clean fresh water and pump through to taps, close taps. Leave to soak for 2 to 12 hours then Rinse with fresh mains water and pump out through taps. 30ml treats 25 litres of water.