EXACTLY. The pH of your Tap (if using straight tap) has to be considered when doing an acv rinse. My tap is very hard and 85% of NC's water comes through granite bedrock. Acv rinses DID NOT work for my hair before I purchased a shower filter. Now, they work fine since chemicals, VOCs, heavy metals, sulfur, rust, etc have been removed before the water touches my hair (and body). My dry skin was also remedied. (whole 'nother thread).
I even notice a difference in how my body feels when I drink tap water versus bottled or filtered water. That is because the body thrives in a slightly alkaline environment and so alkaline water is better. An unbalanced pH environment in the body are detrimental to health. I just dont feel right when i drink tap, and I get more aches, pains, and headaches. More tired too...whole 'nother thread too.
Nonie is our adorable resident chemist at LHCF and she knows all this...I have read enough of her posts to know that she is right!!