I added a bag of Cal Hypo shock yesterday that I had in the shed(since last year). I normally don't use that type of chlorine since I learned that a vinyl linered pool doesnt need the calcium. Anyway, most of the shock seems to have collected in various spots on the bottom of the pool floor(ironically the same spots where the brown dust keeps showing) Does this stuff take awhile to dissolve? Its been 24 hrs now. Is it because the bag is a year old(it was tightly sealed, and unopened).