Wow, thanks guys and gals for the replies, totally helpful. I need to pre-dissolve Cal-Hypo because I want to increase my FC to shock levele just before I leave for vacation on Friday. I really didn't want to get up at 4 am if I didn't have to! LOL!! I have an ABG with a solar cover in place that morning so I really didn't think that dispersing that much around the circle, without pre-dissolving, would be nice. Now I know that I can at least sleep 'til 5:30am, and can get the pool in order, car packed, and on the road by 7am. Thanks a bunch!!!!