ARM 37.115.1308. WATER CHEMISTRY PARAMETERS

(1) Water chemistry, temperature, and clarity measurements must fall within the parameters set forth in Table 6: (2) If total alkalinity is too low, it will result in pH bounce and a tendency to cause corrosion. If total alkalinity is too high, it will result in cloudy water increased scaling potential and a tendency for pH to be too high. Table 6. Parameter Acceptable Ideal Chlorine 2-8ppm 3-5ppm Combined chlorine 0 to 0.5ppm 0.0 Bromine 2-10ppm 2-8ppm Total Alkalinity 60-220ppm (varies by chemical type and pool surface) 80-100ppm for Cal Hypo, lithium hypo, and sodium hypochlorite; 100-120ppm for Sodium dichlor, trichlor, chlorine gas and bromine compounds Oxygen Reduction Potential (ORP or HRR, which stands for High Resolution Reduction) 650 minimum millivolts (mV) 650-750 minimum millivolts (mV) pH 7.2-7.8 7.4-7.6 Cyanuric Acid (allowed only in outdoor pools) 0-100ppm 10-50ppm Calcium Hardness Pools 150-1,000ppm Pools 200-400ppm; Spas 150-250ppm Temperature Pools may not exceed 100º F Spas may not exceed 104ºF Flow through hot springs may not exceed 106ºF Clarity NTUs must be in the range of 0.0-1.0. See ARM 37.115.1315(1) 0 NTU