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, <br />' PURCHASING& INTERNAL SERVICES MEMORANDUM <br /> #99 - 24 <br /> April 12, 1999 <br /> TO: The Honorable Mayor and City Council Members <br /> FROM: James Williams, Jr., City Manager <br /> Beth Couter, Financial Management Director <br /> Deborah M. Perry, Purchasing Supervisor,� <br /> SUBJECT: WATER CHEMICAL BIDS <br /> Attached you will find a bid summary for water treatment chemicals to be used by Water <br /> Production for the treatment of potable water. <br /> The following is a list of the chemicals and how they are used in the water purification process: <br /> Alum - used to coagulate; clarifying agent <br /> Carbon - used for taste and odor control; control of atrazine <br /> Carbon Dioxide - lower the ph level; due to lime <br /> Chlorine - disinfectant; required by law <br /> Lime - softening agent <br /> Polymer - used as coagulant; lowers turbidity <br /> Potassium Permanganate - used for taste and odor control <br /> Sodium Chlorite - disinfectant; used for taste and odor control <br /> Sodium Hexametaphosphate - used to counteract lime, prevents scaling; filter protection <br /> Sodium Silicofluoride - reduces cavities; required by law <br /> Hydrofluosilicic Acid - reduces cavities; required by law <br /> It is staff recommendation to accept the low bids listed on Exhibit A for each of the water <br /> treatment chemicals for May 1, 1999 -Apri130, 2001 as follows: <br />