Raising Ph

I use rainwater for some of my house, mainly the hot water service and cold water to toilet and washing machine. The water is a bit acidic (normal due to CO2 I believe) which is causing blue colouration presumably from copper pipes. Aside from aesthetic consideration of blue stains in the shower I wonder if this is significantly corroding the pipes. Staining seems to be worse in hot water, e.g. noticeable in the shower after a few days but not in the toilet.

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