I hope you have soft water, that would be great! But just to be sure you should call your water company or get the test kit. For instance, my area shows as "Moderately Hard" on the map but a test showed it was "Hard."
With shampoo bars, I tend to shed more in the shower than I did with detergents but my shedding the rest of the time is practically nil so overall I shed a lot less.
I don't think your water hardness or softness had much to do with your baking soda/vinegar results. It is likely the vinegar rinse was too strong. I have found that when I use anything too acidic on my scalp that my hair gets greasy very quickly. I think it's pretty much the same thing as the scalp crud we were talking about a few pages back (which is really just hardened sebum), it's my scalp trying to protect itself from damage.
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