Well, cleared the swamp (Thanks everyone!) through SLAMing, then we had a flood that put a lot of debris and sludge in the pool. I've finally got it pretty much clean. Deep end is just slightly more greenish than I'd like, water is a bit dull. I raised the chlorine to SLAM levels a few more times during the cleanup. The flood was the result of 2 feet of rain in one day, plus a lot of dirty water flooded in, and I have had to change a lot while vacuuming to waste, so my chemistry is very wonky.
I tested this morning.
pH is 7.8
the CL/Br test is almost invisible, definitely below the .5/1 levels
TA is 90
CYA can't be read ... I filled the tube completely and could still see the black dot, so it's less than 20. It was starting to cloud the water by 30, so I don't know if that means the CYA is not zero for sure. I don't know enough about how that test works.
I don't see any indication of algae, btw. But there are some spots that need to be scrubbed better (corners) - I need a different brush. Just slightly dull patches. Oh, and if it matters, the water temp hangs around 74-75F.
We're also forecast for more heavy rains and flooding, but I HOPE that it won't end up in the pool again. The flooding last week was kind of freakish - that hasn't happened here in many years. The risk is over the next 3 days or so.
So, is there I way I can tweak the CYA test? Can I go ahead and add chlorine to prevent problems, but if so, how careful do I need to be? I'm not positive of the volume of the pool - tests seem to indicate it might be a little smaller than 18K gallons. (It's an oval but with steep angles.) (BTW, the last time I tested the CYA was a little over a week ago and at that time it was about 38 iirc.)
Help GREATLY appreciated. I really don't want to get back to the swamp, or more problems. I've been spending hours a day on the pool for over a month now, and I need to get it right and hopefully get to swim, LOL.