Marie: I live in Southeast Michigan.

Mary: Yes I am acid washing and sanding myself. Shouldn't be too bad. Looks like I'm postponing another week. The water haulers are backed up at least a week and I want to re-fill as soon as I'm finished (don't want to leave the pool empty for a week).

Lenny: I have very similar situation to you. I completed building my pool late summer 2005 and opened on Labor day weekend. I closed that fall and had no issues on the subsequent open. I have a Merlin mesh cover.

Picture of clean plaster prior to the problems: