Ok, I think I've got the plan. Shock at higher levels till no visible algae and overnight chlorine loss is normal...just like regular shock process.
I wasn't sure it was possible to get rid of all the mustard algae since I can't get pool light out.
I think this will take awhile and lots of bleach. I added 4 jugs of bleach (182 oz. jugs) last night to get FC = 40. This morning at 8:30, FC = 33.
Off to Dollar General (best price on bleach there and at Costco, btw) to get lots of bleach...should have bought stock
Important question, would you swim in this, FC = 40? It is hot as hades in Alabama!!
Thanks so much!!!!!!!