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ing equipment. The statement that much water is needed to bleed the minerals from the tanks to prevent corrosion is probably with­out foundation inasmuch as the water in Las Vegas which is used for cooling and ice making purposes is pure water and not even lightly mineralized. (Water Resources Bulletin Ho. 5) The Commission is also of the opinion that the rates as set forth in Rate No. 21, which is now under suspension, on cool­ing water for air conditioning, refrigeration, ice making and other similar equipment should be revised to conform to the followings that during the period January 1, 1952 to and including November 30, 1952 the rate set forth in Rate No. 21 on cooling water for refrig­eration machines, effective September 9, 1952, was unreasonable and unfair for the type of service sought and to be rendered by the Company, that the Las Vegas Land and Water Company is authorized to waive the collection of any outstanding overcharges which may be due for service provided by the Company prior to the date of suspen­sion of the 1951 tariffs under Rate No. 21, that the Las Vegas Land and Water Company should in equity reimburse those customers who had paid for the service under the 1951 schedule of rates under Rate No. 21 for cooling water for refrigerating machines, that Rate No. 21 for ice making machines be placed in effect as of May 1953 and be on a yearly basis of twelve months, and that the summer season shall be construed as extending from the first of May to and including the thirtieth day of September. The Commission findst 1 - that rates as set forth in Rate No. 21 on cooling 12