PURE Marine uses groundbreaking technology to maintain crystal clear and healthy water in marine aquariums. PURE Marine is a combination of marine specific bacteria and enzymes that provide many benefits including: - Reduces organic waste - Maintains a biological equilibrium - Improves nitrification - Accelerates maturation process - Reduces BOD / DOC / TSS - Rapidly restores equilibrium - Reduces filter and skimmer maintenance and cleaning How do I use PURE Marine? We recommend that you use PURE Marine as part of your regular maintenance programme. You cannot overdose with PURE Marine. To maintain crystal clear, healthy water add 2 PURE Marine balls per 25 litres of water once a week into your marine aquarium filter. Alternatively, place the balls in a filter bag and position in the tank or the filter in an area with good flow.