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5.0
Water Quality RequirementsMaximum Hardness: 7 Grains Per Gallon (120 ppm) Maximum Iron (Fe): 0.3 ppm / mg/L Maximum Turbidity: <1 NTU Minimum UV Transmitance: 75% Water Must be Visibly Clear, Not Cloudy or Murky Statement on Water Quality and System OperationWahl Water assumes no responsibility for the proper operation of the UV System or fouling of the Quartz Sleeve due to water quality issues.