I have a 25,000 gallon in ground concrete / plaster pool. It is an older pool (1998ish) but new to us - we just moved in a few months back. To prepare for the swim season I gave it a good shocking last night. Leslie's recommended 4lbs of Cal-Hypo Shock. I put that in last night at 7:00 PM and now 12 hours later it is cloudy as all heck. Water was crystal clear when I started.
I'm hoping that time in the sun today (Phoenix AZ 97 deg ambient / 78 deg water temp) will help to clarify but I'm still eager for your opinions and advice. Pool needs to be swim-able for Friday.