Quote Originally Posted by dstagg View Post
Why would anyone recommend draining several times instead of one large time. It would require draining much more water in the long run by draining several and get same results with one large drain.
Fiberglass pools need special precautions if they are going to be drained more than about a foot below the skimmer. They might need to be braced with boards to prevent buckling or they might need to have ground water constanly pumped out from under them (the latter could apply to gunite and shotcrete pools also!)