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You are here: Home > DIY Repairs > How A Water Softener Works > Hard Water Map

Average Hard Water Levels in the United States
Shown in Grains Per Gallon, or GPG.
Note: One grain = 17.1 ppm.
hard_water_chart

Hard Water Map

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Hardness Drops - Test Kit Hach 5B cat.no.145300 Test Kit Hardness Drops Test Kit Hardness Drops with Iron and pH levels
Hardness Drops - Test Kit Hach 5B cat.no.145300 This kit contains the necessary materials to conduct multiple  tests of the hardness ( in grains per gallon ) of the water. This kit contains the necessary materials to conduct multiple tests of the hardness ( in grains per gallon ) of the water.
AND 50 test of IRON Levels and multiple pH tests.