1. A high chlorine level does have an effect on pH--it tends to read falsely high.
2. You could safely swim when the chlorine is 10 or lower, with a CYA that high, but I would wear old suits just in case of fading.
3. It really won't hurt anything to cut back your pump time, but won't help, either--remember that chlorine kills the stuff in the water but the pump/filter is what removes it. So if your water isn't the clarity you want, I would leave it on. After it clears up, then cut the run time back. One other comment there--even though you had less than 1 ppm chlorine loss overnight, you might consider keeping the pool at shock level for one additional day, just to make sure it's all killed off.
4. When you're finished shocking, just let it drift back down, but not below 5 ppm, ever. It probably won't take but a day or so to get it down to 10, and once kids are in the pool, it'll be less in no time!
Janet
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