Soft water is water that has reduced minerals in it, hopefully dramatically reduced… usually achieved through an ion exchange with sodium charged resin beads in a tank. The reduced minerals exchanged for sodium creates a water that dramatically reduces the amount of minerals that build up on the hair or scalp which usually cause irritation, itchiness and drying. Soft water is significantly better for your hair and scalp and helps hair retain more moisture. The effect is immediate with good soft water vs hard water in my experience. If you wash your hair with soft water even once, you’ll be like yeah that dude was right.
Edit: If your hair is dry..I’ve said it before in these forums try some Living Proof 5-1 before blow drying it’ll help smooth it out. I’m curious to, have you thought that some of the dry frizzy hair could be regrowth of terminal hairs just weaker because the follicles were dormant due to taking oral Min? It’s possible🤷♂️