Thanks for all the relpies! Try to answer some of the questions. Yes, I see the seeds. Actually, they look more like stamen from lily-like plants. When I pick one up from the bottom of the pool they just crumble and leave nothing but the stem. I have searched my back yard for anything that looks at all like them, but to no avail. They are tiny, and leave streaks that look like rust stains. I am thinking that they are blowing in from the neighbors. They have not faded at all in two weeks. I vacuumed once, and have tried brushing them, but it doesn't seem to have any effect that I can tell. Like I said in the first post, it sure would be nice to have clean and bright plaster after finally getting a handle on the black algae that has plagued us for the last four years!
My pool water is almost perfectly balanced and is crystal clear. Here are my latest test readings:
fc-5
cc-0
ph-7.6
ch-210
alk-90
cya-35
temp-80
As for my location, we live in the Memphis, TN area, and my pool is about 20000 gal with white plaster.
Just wondering if anyone has seen anything like this and found a solution.