*sigh*....a few weeks ago I tried treating this problem i am having with Sodium Bromide...and I thought I had it cleared up. This may or not even BE mustard algae. But something is going on. A month ago I was seeing piles of tan colored sand on the bottom that if left alone would turn bright yellow..i cleared this up with the sodium bromide and lots of clorox. Then a week after it cleared I started seeing miniature " maybe a third the size of a golf ball" little piles that were multi colored kind of green/brown that were loose and seemed to hover on the bottom like tumbleweeds. I was told this may be pollin? Anyway, I vacummed them up and now yesterday after a bad storm I see ALOT more of these ...and without thinking this morning I vacuumed them all up and then I took the DE filter offline and cleaned it and cleaned it and cleaned it. I now have it back running with fresh DE and I am wondering what I should be doing. I keep my FC between 3 and 5 with a CYA of about 35. I was thinking about throwing in a bottle of polyquat...but first I will listen to what you guys think...and if they show back up in a day or two this time I will take a picture. Inside the DE filter was a kind of gross sludge even after backwashing all the DE out of it.

PS after the fresh DE I raised the FC level to about 10.