Patent ID: 7763171

Claim:
In a reverse osmosis system, a method comprising: eliminating hesitation in initial dispensing of product water from a storage tank full of product water by squeeze water on an opposite side of a diaphragm in the storage tank by: providing a storage tank having: first and second molded shells coupled together to form an enclosure; a bladder within the enclosure and coupled to separate product water from squeeze water within the enclosure; a first port through a wall of the enclosure to provide water access to the product water side of the bladder; a second port through a wall of the enclosure to provide squeeze water access to the squeeze water side of the bladder; the inner surfaces of the enclosure having a plurality of protrusions integrally molded on the inner surfaces of the first and second molded shells protruding inward in the enclosure and emanating from the vicinity of the second port to hold the bladder locally away from the inner surfaces of the enclosure when the bladder is full of product water for accommodating squeeze water flow into the enclosure between the enclosure and the bladder when the bladder is full of product water; coupling the first port to a source of product water in the reverse osmosis system; and coupling the second port to a source of squeeze water in the reverse osmosis system.