I have another question about my pool chemistry.

At what concentration would calcium try to precipitate out? I ask because lately I have been seeing little white flakes in the pool, and on close examination they appear to be the consistency of wet flour but just a tiny bit of grit to them. Not very many of these flakes, and nothing like this is showing on the filter.

Before it is asked, no, I haven't been able to order the K-2006 kit yet. Lack of $$ is the only reason. So I'm still using the HTH 6 way.

Another oddity happened in the last couple of days. I've been trying to keep the chlorine level up between 5 & 8, but lost a LOT of it overnight between monday and tuesday. Was down to 3, so I dosed the pool with a gallon of 6%, in several doses tuesday. Seems to be holding now. There was no slimyness to anywhere on the liner prior to this, but that doesn't mean I wasn't about to get an algae bloom. Something used up the chlorine though. No clue why it would drop like that overnight, And without the FAS-DPD, I don't know what the CC level was.

Last night test results:

cl 6
pH 7.3
TA 110

Water remains clear, and no eye or skin irritation.