Replacing water to get rid of CYA

[BillyBumbler]

So, if you shouldn't completely drain a pool because ground water might push it up, how do you resurface a pool when it's time?

[cwstnsko]

I believe one option is to dig a sump next to the pool and pump off ground water continuously during the refinishing process. In some areas, careful choice of the time of year to do the refurb can help.