Certified valuesAlkalinity,Total(as CaCO3).46mg/L Hardness, Total (as CaCO3).65mg/L Ammonia (as N). 0.045 mg/L Magnesium. 4.1 mg/L Calcium . 18.9 mg/L Nitrate + Nitrite (as N) . 0.16 mg/L Chloride . 11.5 mg/L pH. 7.8Conductivity (25°C) . 164 mS/cm Potassi