Even the best drinking water is nowhere near being good aquarium water. Because chlorine, heavy metals and organic pollution in our tap water are often the cause for various problems in fishkeeping. In this regard not only high silicate and nitrate concentrations in the tap water create problems for fresh and marine water aquarists. Different grades of tap water hardness also weigh on the aquarist. Reverse Osmosis Systems produce optimal raw water for marine and fresh water aquaria and help to solve water problems.