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 cleaningHow 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.