Tap water that high should have plenty of Ca in it (CaCO3 is what drives the pH of tap water up in many, many cases) but that pH is too high for plants and will need to be adjusted down to about 6.7 before use.
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Tap water that high should have plenty of Ca in it (CaCO3 is what drives the pH of tap water up in many, many cases) but that pH is too high for plants and will need to be adjusted down to about 6.7 before use.