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Reverse osmosis 3 stages for aquarium It is the best method for clear water for aquarium. Due to high membrane’s quality is possible to filter up to 280 liters per day. Membrane’s permeability (0,0001 μm), allows the removal of most pollutants of the water inclunding bacteria and viruses. In adittion it has 2 prefilters (in line carbon and in line polypropylene) in order to protect membrane from sediments, solid particles and chlorine.