Maybe I'm overthinking all of this...

Running through some new tests on my colorimeter (Hach DR870), I cant seem to figure out the hardness. I'm measuring hardness using the calmagite colorimetric method (Hach method 8030). In my city water samples, I have been consistantly getting 3.7 to 3.9ppm total hardness (3.4ppm MgCO3 + .4ppm CaCO3). The same samples read 60-70 on 2 different types of "test strip" methods. Is my city water that low or is there something I'm missing?

Justin McLeod
If you don't know where to start, go back to the beginning.

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