Hello, I have a Coleman Horizon Spa 455(?) that I have one question about. After draining, refilling with soft water and adding hardness, total Alkalinity, and Bromine tabs, I have developed jagged deposits under the water level throughout the tub area. It feels like coarse sandpaper and it has given me a brush burn from sliding around in the tub. The pH was a little high so I added decreaser a few days later to bring that to an acceptable level. Any idea how to remove these deposits, or prevent them in the first place? I did add the chemicals to cool water and not up to temperature water. Could this have caused the deposits? I hope the high pH didn't hurt the tub.