Abstract: A reverse osmosis water purifier system uses municipal line water pressure to separate pure water molecules from dissolved and undissolved matter. The system makes and stores product water in a sanitary enclosed pressure vessel in the absence of back pressure. A small water cell tank and a hydraulically powered control valve enable delivery at a fast flow rate near line pressure flow rate. The control valve is a combination sensing and multiple valving device that automatically turns on product water when it is called for by a user or an ice-maker. It automatically replaces water that is drawn, then turns itself off when its tank is full. It fast flushes the dirty side of its R.O. membrane while fast flow water is being drawn, and it slow flushes the same side of the membrane while the system is making product water. These alternating slow and fast flushes whisk away residue from a built-in brine restricter. All flushes sweep debris down the drain.

Abstract: A reverse osmosis (R.O.) water purifier system that collects and stores pure water at low pressure and dispenses it at high pressure. Impurities left behind when the water passes through a R.O. module are disposed of by two methods: the fast flush method and the slow flush method. In the fast flush method, water entering a R.O. module may take two paths to escape therefrom. The first path constrains it to travel through a semi-permeable membrane in the module which filters out undissolved solids and which restrains the passage of dissolved liquids. The second path allows it to travel through the R.O. module, without passing through the membrane, thereby carrying out those impurities left behind by the water passing through the membrane. The purified water is directed to one side of a compartmented storage tank and the waste water from the module is directed to a control valve.