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Patent 3493496 (Purified Water Supply Apparatus and Method)
Apparatus for supplying water under pressure from a water purification system which operates by introduction of impure water under pressure. A pressure-resistant closed tank is arranged to contain a driving fluid under pressure and into which purified water from the purification unit is introduced. The driving fluid, which may be a compressed gas, for example air, or a liquid under pressure, for example water, drives stored water in the pressure resistant tank under pressure to point of use. The driving fluid and temporarily stored water in the pressure-resistant tank are separated by separation means, for example a diaphragm.
This invention relates to a water supply device and one that will supply water from a water purification unit to point of use under pressure. The invention is particularly adapted for use in temporarily storing, under pressure, water which has been purified by a purifying system operating under above atmospheric pressure, such as reverse osmosis.
Systems for purifying water by reverse osmosis have now become practical. The process consists essentially of forcing impure water under pressure through a semipermeable membrane which separates salts and contaminant solids. The product water is of much improved purity; treatment of brackish water, for example, can produce a potable product containing less than 500 p.p.m. of total dissolved solids.