![]() Damage matters more than mineral content, presuming you have hard water to begin with. Damage creates more free negative charges for positively charged hard-water mineral ions to bond to. The more damaged the hair (heat, highlighting, permanent color, relaxer, permanent wave, brushing, sunlight, mechanical damage), the more minerals will bond to it. It also finds its way beneath the surface layers. Quick summary: Hard water minerals bond to hair in the same way that conditioner does. For example in some places, "Very Hard" water begins around 300 ppm. NOTE: This categorization is provided by the United States Geological Survey, it is not an absolute reference. Soft Water: 0-15 ppm or mg/L (1 gpg) gpg = grains per gallon I did some digging into a 2011 article published in the Journal of Cosmetic Science 1 to find this information for you - I hope you'll be able to put it to good use.
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