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Anion-Cation Charge Balance <br /> Anion-cation charge balance is calculated using concentrations of the major <br /> anions and cations in milliequivalents per liter (meq/L). The difference between <br /> the two sums is calculated as a percentage: <br /> Anions-Cations X 100 <br /> Anions + Cations <br /> We use +/- 5 percent as a guide for an acceptable percent difference. <br /> Analysis of the major cations and anions is required only once annually. Major <br /> cations and anions were not analyzed in 3rd Quarter 2009. Therefore, the anion- <br /> cation charge balance could not be evaluated this quarter. The anion-cation <br /> charge balance will be evaluated in future quarters when the required <br /> constituents are analyzed. <br /> - E-3 - <br />