I don't know about the "not filling at night" advice--if you already have a substantial amount of water in the pool, I wouldn't think it would matter, but Waste or Pooldoc might be able to help better there. I know they filled my pool in Louisiana during the first week in July (102 degrees during the day) when it was installed, and they filled it overnight with no problems.
I would probably not adjust the water completely until the pool is filled--but I would add a little bleach, swirled around really well so that it doesn't contact and bleach your liner, as the pool fills. That should be the first priority--you don't want it green from the beginning!!
Your number 2 event would be the pH, and it can be dealt with at the same time as the chlorine. If it's at least 7.0, then I would leave it alone until the pool is full. If your fill water is substantially below 7.0 (I'd be surprised if it is) then you can pre-dissolve a little Borax and add it--but adding a lot of Borax to a little bit of water is going to raise it way high, so be careful.
It would be helpful if you could post the test results numbers--without them, we're just guessing at what you need to do
Also for clarification, is this pool 52 feet round and 2 feet deep?
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