72201152
Sep 2, 1964
Aug 9, 1966
SODIUM CHLORIDE USED IN A WATER SOFTENING MACHINE TO WASH THE BED OF RESINS OR ZEOLITE AFTER A PERIOD OF USE; TO REGENERATE THE SAID RESINS IN ORDER THAT THE RESINS ARE EFFECTIVE IN SOFTENING THE HARD WATER PASSING THROUGH THE WATER SOFTENING MACHINE
Metal Goods