Where do I go from here :?
First off the pool looks great...but, It still has the 'dust' issue when I brush the walls.
I did an overnight FC test last night (filter running all night) and I lost only .5
The water looks the best it has looked for a long time, but I still am fighting the 'dust'.
I brushed about 1/3 of the pool last night and it clouds up the entire pool, than this morning it looks crystal clear after the dust has settled again. I vacuumed the bottom also this morning (why not, I was up at 6:00 to check the FC)
The dust settles right back on the walls it seems. I brushed a part of the wall that I also brushed last night and it seemed to be about the same amount as when I brushed it last night?
I just want it gone! but don't know how to get rid of it...or what it even is?
My test #s from this morning are:
FC 4.5 ( I just added some liquid chlorine I usually keep it around 7-8)
TC 4.5
PH 7.8
TA 80
CH 270
CYA 50
I am adding about a half gallon a day of 12% chlorine the pool is using about 3 ppm daily (which is normal from what I have read here).
Since it seems that it is not mustard algae (based on only losing .5 overnight) does anyone have any suggestions about how to get the 'dust' out, or even if there is someplace to send a sample of the 'dust' to identify exactly what it is?
I am planning on taking a couple of pics today and will post later tonight. I am happy that the pool looks so good, don't get me wrong

But, I am still puzzled on the 'dust' issue.
thanks.
...Eric