OK, sorry if this is a no-brainer, but I just have to make sure.
A fellow swimteam mom who works for a pool store told me that hardness is important for vinyl pools for maintenance of the plasticizers in the vinyl. Since I had to take both parts of organic chemistry twice , I don't have the confidence to argue the point with her, but I can't see how Ca would help stabilize a polymer. Anyone think they can make an argument either way? My thinking (which may be flawed - see chemistry skills, above) is that destabilizing the vinyl with low hardness is poo. (Very scientific, I know). Anyone care to enlighten me why this is or is not possible?