I seen were you put wood ash in with the water, I had one soaking this yr, hair started to slip in a few days I had it in a bucket and forgot the door to my shed open and the dogs got it. back to square one. From what I understand is the ash and water turn to lye, so you have to soak it in fresh water after to bring the PH back down. (PH, I think is right.) Not sure what the lye did if anything to the dog. Ed