Vinyl liner feels like sandpaper

I've tried searching this one and have found very little information on it anywhere...I did see one post at Troublefreepool.com that talked about it resulting from a higher pH over a long period of time. They recommended lowering the pH to 7.0 for a while and allowing the buildup (of calcium?) to dissolve. The buildup does come off with some serious scrubbing, but I'm not sure I want to rent scuba equipment so I can do the entire floor of the pool (16' x 36' from 3' deep down to 8') :) Anyone have any recommendations?

DE filter/Hayward pump
FC 16
CC 0
TA 80
pH 7.8 (I usually run mine a little high and it works for our pool)
CYA 85 (again, a little high but perfect for our SETX full-sun climate)
CH 250

What kind of pool is this? Inground or AG and if it is AG, by any chance it is an aluminum wall pool?

It's an inground.

It doesn't make sense that you would have any calcium buildup with a CH of 250 and a TA of 80...just not high enough. If your CH was 500 and your TA 200 I'd buy it.

I think you have another cause of the buildup. You could try the low pH thing--but do NOT let the pool get below 7.0--and don't try it unless your test kit measures BELOW 7.0 (like 6.8). Because when pH measures at the lowest level it could be far lower, and anything below 6.9 is dangerous to vinyl liners.

Do you actually SEE anything, like cloudy water? Is it pretty clear, totally clear, or crystal clear (where it seems to sparkle like a gem)? I'm guessing here, wondering if something else is in your water....