Coralife Pure-Flo II RO Systems produce clean, pure water from chlorinated or non-chlorinated source water. Premium Thin Film Composite (TFC) units remove up to 99% of hardness, heavy metals, toxins, and many other impurities. The Coralife Pure-Flo II units include clear filter canisters, cartridges and faucet attachments. Economical and easy-to-use, all units are wall mountable. By simply reversing the two outlet fittings, the units can be flushed without a flush kit. 4-stage RO/DI unit with mixed-bed resin deionization cartridge removes any additional impurities to produce 99.9% pure water. Pure-Flo II with integrated diaphragm pump increases water pressure to maximize production. Units with diaphragm pump are highly recommended for areas with low water pressure. Great for Freshwater or Saltwater Aquariums.