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Thanks for the reply and the explanation about calcium - but which of the two is the Domestic Heating Compliance Guide Table 9 referring to?

I've got 3 questions on water hardness and the building regs: 1. The Domestic Heating Compliance Guide says in Table 9 that if mains water hardness exceeds 200 ppm then provision for treatment should be made. Our water company's website says that our area has a hardness of 150 ppm as calcium...