It works great in hard water!
I have very hard water and have tried several other shampoo bars without success. They all left my hair feeling gummy. This one rinses cleanly and leathers well. I've used it twice so far without following it with conditioner and my hair loves it. My hair has been very oily for the last several months and looked horrible the second day. And with this bar it is far less oily and I am able to skip days. Just ordered a second bar to put in the camper.
Rating: 5 stars