The Multipure Model MP750 Plus RO combines Multi-Pure’s renowned carbon block filter technology with the reverse osmosis technology, making it the most technologically advanced System in the world today. The Multi-Pure MP750 Plus RO is the only device certified under NSF/ANSI Standards 42, 53, and 58 to reduce: Nitrates/Nitrate, Arsenic V, Chloramine, PCBs, Toxaphene, Chlordane, Lead, Mercury, etc. The Multi-Pure MP750PlusRO Unit is easy to install and simple to operate. It uses no electricity and the impurities removed through the reverse osmosis process are flushed down the drain. The pre-filter component provides 5 micron filtration to remove large particulate matter and extend the life of the reverse osmosis membrane. The reverse osmosis component reduces the level of Total Dissolved Solids (TDS), rust, dirt scale, and organic tastes and odors. The processed water is conveniently stored in a 3 gallon pressurized tank which is small enough to fit neatly under your sink. Multi-Pure's MP750PlusRO Unit includes pre-filter, RO membrane, and Multi-Pure’s Model MP750SB as a post-filter, giving you the highest quality water possible. Sediment prefilter #CBC110, replacement cost $4.50 , Carbon block prefilter #CBC112 replacement cost $12.95, Membrane for reverse osmosis unit #CB-ROM replacement cost $99.95 (all costs plus shipping).