Yellow/Brown dusty deposits that reappear repeatedly

[fuelman]

Hello everyone!
I've been tring to find out what this stuff is myself! I had to drain and refill my pool about 2 weeks ago so the installers could add some more sand under my liner due to settling. I drained it down to about 2" then it rained the next day.
We got 3" of rain which sat in the pool for another day till the installers came to do the repair. Anyway, I started refilling the pool after they finished.
Once full I added 4lbs. of CYA, and 2GALS of pool store chlorine approx 6%.
I checked the CL. level the next day and it was 1.0 PPM so I added more to bring the level to 4 PPM which is where I wanted it. It held there for about 1 week then this stuff showed up. First I hand vacuumed and it came back a little at first then it got worse till it covered most of the bottom and I've been adding about 1/2 GAL of chlorine daily to keep the level at 3 PPM. Then I PANICKED. I went to the pool store ( Pinch-A-Penny) and let them sell me some Super Green Algicide. I dosed the pool with 4oz. as per directions.
and let it work for 24 hrs. then vacuum to waste buy hand. Looked real good just a little cloudy. This was yesterday, This morning I added 3/4 GAL of chlorine and went to work. I just got home and checked and I think it's back just a very little on the bottom so I have the auto-cleaner running now.
My numbers are CL 3.0
FREE CL 4.0
PH 7.4
CYA 40
COM CL 0.0
TO ALK 125
My pool is a 10,000 GAL Above Ground w/ a Clearwater 2600 sand filter What can I do? Help.