LaMotte actually measures Total Hardness and not Calcium Hardness, no matter what LaMotte calls it in their paperwork. Total Hardness depends on a lot of other hardness factors other than just Calcium. Total Hardness depends a lot on your local water.
The ColorQ does not test FC levels above 10 ppm (reads high). This makes the ColorQ useless for doing the SLAM Process or other tests where your FC can be above 10 ppm.
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