Originally Posted by
MusicalSpoons
It also depends on pH and other water quality factors. pH in particular because the higher the pH, the more the hard water ions interact with the hair; but also what else is in the water, not just calcium carbonate and magnesium.
Edit: but yes, actual hardness does make a difference. Once it reaches 'very hard' on the scale that only tells you the minimum hardness, not how hard is *actually* is (a bit like iii hair could be 4" or 6"+, which is a huge difference).
We have what's classed here as very hard water (~330ppm) but the pH is always around 7 and there's no appreciable iron or copper or anything else really in it, whereas I hear of awful water elsewhere in the world - alkaline, orange, tastes of nails, etc.
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