My tap water report mentions that it contains 72ppm of Ca and 26ppm of Mg. Also mentions that the Hardness is 290ppm and KH or 130. The hardness and alkalinity are very consistent with my test results (300ppm GH and 120ppm KH). My question is :
- How come the hardness is close to 300ppm and my Ca + Mg is around 100ppm total. Is there anything else that GH take into account ?
- How come the hardness is close to 300ppm and my Ca + Mg is around 100ppm total. Is there anything else that GH take into account ?