Pure Reef Balance uses ground breaking technology to maintain crystal clear and healthy water in marine and reef aquariums. Pure Reef Balance 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 Reef Balance as part of your regular maintenance programme. You cannot overdose with Pure Reef Balance. To maintain crystal clear, healthy water add 2 PureMarine 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.