NSF 58 Standard 5 stage Reverse Osmosis Unit Micro Computer Controlled Fully automated with the Micro Computer Control add on - Now compare this to other sellers! Great Value! All the pure water system Reverse Osmosis models consist of RO and Post Treatment process when added together produce the finest complete water treatment system. This is the only proven way to take out the contaminants in your Town Water, Tank Water and Damn / Pond Water. For those that do not like Fluoride this is the only means of eliminating this additive in your Town Water. Micro Computer Controlled for full automation, this is the main advantage over other system being currently sold. Added Value at no Extra Price.