Yeah that's interesting about the ph, this is the second season for my dolphin and my ph is always around 7.6 in my vinyl pool and i can't get it to stop climbing the walls Ha!
I am very interested in how it turns out for you as i would like to get 4 or 5 years out of this investment before having to worry about serious repairs.
I wonder if wear on the rollers could effect this and not be visibly noticeable at least not enough where you would think about replacing them. I remember reading you should keep the rollers wet, not sure how to accomplish this as i put it in the shed after each use.

anyway wish you luck!


Randy