I TOTALLY understand this statement....
One thing that is going to make a huge difference in your outcome over vacation is what kind of shape your water is in before you leave. I don't know when you're planning to leave (and it's probably better that you don't post it here), but I'm hoping that you can clear up your current chlorine demand by maintaining a shock level until your chlorine loss is normal BEFORE you go. Having a stable chlorine usage will give you a much better chance at clear water on your return.
Polyquat is a good idea, also, just as an insurance, it certainly won't hurt. Polyquat does create a pretty good chlorine demand, or so I understand from around here, so once you add it and let it circulate, you need to then raise your chlorine back up.
Your pH is high enough that a couple of trichlor pucks in a floating feeder wouldn't hurt (unless it will create issues with the cover, again, you need some input from someone who uses a cover on that issue) because your pH can stand to come down a little bit anyway. If you decide to go that route, though, just make sure to tie it somewhere that it can get circulation but can't float over and sit next to your liner to fade it by dispensing pockets of chlorine and low pH while the pump isn't running.
Janet
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