Evolution Aqua Pure Reef Balance 60 balls, a Marine specific beneficial bacteria treatment. The Reef Balance balls contain a unique combination of live marine - specific bacteria and enzymes. Delivered in gel like balls, this combination ensures a population of live bacteria will instant colonise filters, substrates and decor, tank water and other internal surfaces. The reef balance will get to work instantly to digest waste as well as convert ammonia and nitrite to make the water safe and healthy for the marine fish. The balls help create a perfect balanced ecosystem for fish, corals and other invertebrates in either fish only or reef aquariums. Not only does the reef balance benefit the fish, but it can reduce the waste and in turn reduce the skimmer maintenance. Because it is easy to use, it is perfect for newcomers to Marine Aquariums as well as expected reefers. Specifications 60 Balls Use 1 Reef ball per 25 litres of aquarium water every 2 weeks. Place the balls directly into the filter section or sump. For best results place in an area of water flow. The balls can be used in filter socks and net bags. Once in the filter, each PURE ball will release beneficial bacteria into the water, shrinking as it does so. A small white bead will remain once the ball is spent. This can be left in with biological media where it will add to the bio mass, or removed and replaced with new. Frequent use of PURE Reef Balance will help maintain biological equilibrium and prevent bacterial monocultures from forming in aging filters, live rock and sand. Average contents 60 balls, which will dose a 250 litre aquarium for 12 weeks.