Think I got mustard. It's light brownish looks like dirt or sand and poofs away like dust if you brush it. The pool has been covered with solar cover for past 5 days. Just showed up last night when I was doing my nightly check of pool. So I brushed all the brown and went up to extreme shock level. Ran filter.
It started like this.
CYA 35 last weekend (had some rain)
TA 90 2weeks ago
Added 1gal cheap bleach 11ppm
Brushed pool. Check again in 30mins
Added 2ND gal of bleach 11ppm more. Test 30min
Now at mustard shock level. Left filter run.
Checked 7am before work Approx 8hrs later.
I added another gal or 11ppm before I left and brushed again and filter running. Solar cover still on. Im going to check levels brush and vac when I get home and do a really good backwashing.
Im leaving for the weekend. Tomorrow at noon coming home sun at noon. Hopefully it won't go crazy while im gone. I was gonna get it up to 30ppm before I leave and run filter on 12hr cycle.
Im pretty good with checking levels I check Atleast once a day. I have noticed the increased demand 4-6ppm with the cover on. But thought my CC was just due to the cover. Guess I was wrong. I'll increase filter run time from 4hrs to 8. After I pass OFCL test. And I'll be buying a wall climbing auto vac. Hopefully that will prevent any issues in the future.