Hello,

I have an inground 18 x 36 vinyl pool; 24,000 gallon. I use Lithium shock (3 lbs.) weekly and it works great. However it is very expensive, as You all know.

So why do I use it? I was told by tghe pool company store that One needs to use a different chlorine compound than what You would use for the slow release pucks to help release the bound up chlorine; or something to that affect.

I wouldn't mind going cheaper, but I don't want to use the cheap Calcium Hypochlorite found at Wal-Mart, etc. as We have hard enough water here as it is.

Any suggestions to a granular chlorine shocker for once a week treatment or after heavy use, thunderstorms, etc.?

Much appreciated.

Gary