AQUARIUM REVERSE OSMOSIS FILTERSRO (Reverse Osmosis) and Deionisation filters are necessary for the production of pure water for use in freshwater or saltwater aquariums. Choose from our selection of quality aquarium products to enjoy the benefits of clean water, free of pollutants. We have a wide range of reverse osmosis systems to suit every budget, and we use only high quality components. Our Dow TFC membranes are sourced from the USA. Dow is a global leader in producing super efficient high purity RO membranes. We use mixed bed deionisation resin that removes both cations and anions from the water. High purity water is esppecially important for fish and invertebrates in marine aquariums.