Thanks to all the great information on this site I'm in the final stages of recovering my green swamp. However, I'm having a tough time with the final stains on the sides and bottom of my pool. There are yellow algae looking stains around the sides and in various places at the deep and shallow ends and darker brown stains on the bottom of the pool and steps from the leaves. At first I tried shocking at the normal shock level of 16 for several days and ran the filter 24 hours/day. Then, after suspecting yellow mustard algae I bumped it up to 30 for about three days but it hasn't seemed to make a dent. I tried to keep it up by checking FC and adding bleach a few times a day (although admittedly I sometimes only checked it once a day.). I also brushed the pool with a 50/50 Stainless Steel/Nylon brush once (sometimes twice) a day. I also did an overnight FC test and it went down less than one. I've gone through countless jugs and spent well over $100 on bleach alone. Is there something I'm doing wrong? Is there a stain product I should consider?
Something to note: I had the pool resurfaced two summers ago (white plaster with a blue dye added) and soon afterwards the blue plaster started to look splotched. It progressively got worse until my pool looked like a tie dyed shirt in some areas and went completely white in some other areas. It seems like the stains are only in the white areas; not the areas where the blue has stayed.
Here are my numbers and some pictures:
FC: Currently maintaining at 7