Coralife Pure-Flo II RO Systems Coralife Pure-Flo II RO Systems produce clean, pure water from chlorinated or non-chlorinated source water. 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 purchasing a flush kit. (Stage 1) units employ Sediment Pre-Filter Cartridge for ultra-fine pre-filtration, Carbon Block Cartridge. (Stage 2) for chlorine removal before reaching the TFC (Thin Film Composite) RO membrane. (Stage 3) to effectively remove up to 98-99% of hardness, heavy metals, toxins, and many other impurities. (Stage 4) Want the cleanest water possible? Get Coralife's 4-stage RO/DI unit with mixed-bed resin deionization cartridge. It removes any additional impurities to produce up to 99.9% pure water. Low Water Pressure a Problem? Pure-Flo II with integrated high pressure diaphragm water pump increases water pressure to maximize production for house holds where water pressure is to low for optimum RO unit operation. Coralife Pure Flo RO Systems are great for Freshwater or Saltwater Aquariums.   Coralife Pure-Flo II 3 stage RO -- 24 gallon-per-day Sale price $134.99    Coralife Pure-Flo II 3 stage RO -- 50 gallon-per-day Sale price $159.99     Coralife Pure-Flo II 4 Stage RO/DI -- 50 gallon per day Sale price $189.99.   Coralife Pure-Flo II 4 Stage RO/DI 50 gallon-per-day w/ high pressure pump Sale price $299.99   Coralife Pure-Flo II -4 Stage RO/DI 100 gallon-per-day w/ high pressure pump Sale price $349.99    Coralife Pure-Flo II - Add on Deionization System. Turn your RO System  into a RO/DI System with this add on Sale price $79.99