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Hope your party went perfectly except for the cool weather. Bummer!

Quote Originally Posted by BigDave View Post
I just re-read about the Tuesday pool party - perhaps you should wait until after the party to shock.
Just a thought here. If you decide to take your pool to shock level and follow the overnight test procedure, you may want to do one more thing.

If you have underwater lights (which I think you may), and haven't yet cleaned them, consider doing this:

While FC is high, unscrew and release the lights. The screws SHOULD be only lightly hand-tightened for ease of removal. Scrub the cords, screws, in the niche itself, everything. Leave the lights off for a while and let the high-chlorine water really get into the light niche(s). While you're doing this, you can soak the light housing(s) above the pool in a bucket of chlorine-saturated pool water.

Water sits behind those lights with very little circulation and can harbor all sorts of nasty stuff that can contribute to chlorine demand. Cleaning behind lights is one of those occasional maintenance items that often doesn't get done or done often enough. Shock levels are the perfect time to do this.