Abstract: A reverse osmosis system to be connected to a feed water conduit and producing permeate water is disclosed. The reverse osmosis system includes a plurality of tubular bodies each having a first end and a second end, a first inner end plate attached to the first end of the tubular bodies, and a second inner end plate attached to the second end of the tubular bodies. The plurality of tubular bodies houses a filter, a pump, and two reverse osmosis membranes therein. The plurality of tubular bodies is configured to be connected in in fluid communication with each other via channels disposed within the end plates.

Abstract: A water purification system includes a first reverse osmosis device, and a water storage tank including a tank inlet and a tank outlet, the tank inlet configured to receive a permeate of the first reverse osmosis device. The system also includes a second reverse osmosis device including an inlet that is connected to the tank outlet and an outlet that releases a permeate of the second reverse osmosis device. The system provides treated water having a purity of about 0 to 20 ppm, which is sufficiently pure to provide spot-free washing and/or rinsing of objects such as vehicles, buildings and windows.