I lose about 0.25 to 0.5 PPM per day, my CYA is less than 20 (pool store tested it a while back at 17, but not 100% sure I trust their numbers, it started at 0, I used pucks for about two weeks before I became "enlightened" ).

My pool gets 0% UV exposure. It is indoors. I do not get leaves in my pool, but I do get a few centipedes, earwigs and spiders, although the spiders tend to keep on the walls trying to catch the other two.

When I have heavy bather loads I can lose 1 to 1.5 PPM in a day.

I suppose I don't count though.