How to Use Water Hardness Test Strips Water hardness test ...
2014-12-11 · How to Use a Simple Water Hardness Test Kit - Test Strips. We used the JNW Direct water hardness test kit strips (Amazon.com) to test the hardness level of the water supply in San Miguel de Allende, Guanajuato Mexico (Col. San Antonio) in March of 2019. The test procedure and test results are given here. [Click to enlarge any image]
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