How To Test Water Hardness for Espresso and
2019-1-21 · the use of “hard” water. Serim GUARDIAN WATER HARDNESS Test Strips have color blocks at levels of 0, 10, 25, 50 and 120 ppm. (This correlates to 0, 0.6, 1.5, 3 and 7 grains/gallon, respectively.) The test strips are supplied in a ready-to-use form. When placed in contact with the softened water sample according
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