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and to the quality of the water in this area, they claim that the reasonable amount of water for cooling purposes would be ten gallons per ton of refrigeration per hour." He testified that all of the representatives agreed that all of the data submitted in the previous hearing by Mr. Bearden and others were substantially cor­rect for laboratory tests, "that is where you had ideal conditions of air and water, then that would be possible, but that didn't rep­resent a realistic situation at all. And particularly in this part of the country where you have excessive hot weather and also a high degree of mineralization of the water. It is necessary to bleed the tanks more than you would in a laboratory where you have a fine quality of water," The figure of ten gallons per hour per ton "includes all use of water evaporation and the bleeding for min­eralization." Mr. Stava explained that the rate under Air Conditioning Equipment, Commercial, was based on a use of water sixteen hours per day. Under Section (c) of the rate as submitted there is set out that each ton of capacity over one ton would be at the rate of 50 cents and that that was computed on the basis of ten gallons of water per hour per ton of refrigeration, and that for a sixteen- hour day this would amount to 4800 gallons per month and a nominal rate of 10 cents per thousand gallons was placed on that, which re­sults in an actual charge of 48 cents per ton of refrigeration, or approximately 5U cents. The basis of the computations was the cool­ing equipment which apparently is more or less the same for all types of cooling systems except for evaporative coolers. For ice making machines the rate of one dollar for each ton ~ 9 -