If you have been relying on pool store testing there is a very good chance that the CH is not that high and it is testing error. Not uncommon at all. Once you do get your kit do the calcium hardness test with a 10 ml water sample, 10 drops of calcium buffer and three drops of indicator (instructions in small print in the lid of the test kt at the bottom of the calcium hardness test section). This way every drop of titrant will equal 25 ppm CH instead of 10 ppm so the test will go much faster for your suspected high calcium levels and you will see the color changes more readily.