The U.s. Public Health Service Water Hardness Classification Table

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Water Info
Water Hardness Classification
The U.S. Public Health Service Water
Hardness Classification Table
Water Hardness measured in Grains Per Gallon
of Calcium Carbonate (Limestone)
Treated Water ...................... 0 to 1 Grains per Gallon
Slightly Hard Water ............. 1 to 3.5 Grains per Gallon
Medium Hard Water ............ 3.5 to 7 Grains per Gallon
Hard Water .......................... 7 to 10.5 Grains per Gallon
Extremely Hard Water ......... Over 10.5 Grains per Gallon
Recognized By the Water Quality Association

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