Out of the tap, our well water has a kH of 161.1 ppm & gH 107.4 ppm (API test). One would think this means pretty good levels of calcium, magnesium and carbonate. I'm curious if anyone knows if the API tests are remotely reliable or can be thrown off by high levels of silicate or other dissolved inorganic compounds? (I'm curious because after observing indications of nutrient deficiencies in plants over the past several months, I suspect that the water is low in magnesium and high in silicates.)
