Reverse osmosis (RO) membrane systems force purified water through a semi-permeable membrane that rejects inorganic, sediment, and high molecular weight contaminants. The whole house system is meant to filter all incoming water to a home or business and may include pre filtration devices. These devices may be carbon filters, water softeners and sediment filters. Typically a whole house RO system will treat drinking water and work water. These systems require a holding tank with a water re-pressure pump and tank. In a home, about a 8×3 foot print and 20 amp outlet are required.