Haven't posted for quite a while - things are going generally very well with the pool now that I'm following this forum. Watermom - you are in my prayers and I think of you every time I sit out at the pool with my kids.

My pool is Inground, 23,500 gal vinyl. Yesterday's readings were:

Temp 66 (but today it is 74!!!)
FC 5
CC .5 - it almost always gives me a .5 reading, rarely 0
Ph 7.4
Alk 150
CYA about 35

My water has been remaining blue and "clear looking", except for the daily slight buildup of what appears to be poofy sand. I have finally clued in (after having this all last year) that this may not be dirt but actually Mustard Algae? But I also saw someone mention that pollen can also act like that.

We definitely get lots of pollen in the pool, especially this time of year, from pines all around. I can see the yellowish buildup on the pool cover and even a bit on the wrinkles in the vinyl at the bottom of our pool (I know, I know, a perfect liner installation wouldn't have wrinkles, but we put in our new liner last spring with borrowed water trucks and good friends - who weren't QUITE as particular and careful as I would have been:-)) Anyway, the pollen layers itself on top of the brownish dusty looking particles.

If it is mustard algae, I have been reading about how to treat it, but I want to figure out what it is before I stop the kids from swimming for a week (now that the pool just got warm enough) and start dumping in $$$ bleach.

Thanks!