Hello, I have been having trouble since June with algae. I am currently starting my 4th slam. Slamming with 8.5% bleach. What is happening is when FC is brought up to slam levels algae goes away. I was bringing to very high levels in June because my CYA was very high (over 100). Hold shock levels for several days as per process until all 3 conditions are met (clear water, holds level over night, CC .5 or less) It would take about 5 days or so for levels to drift down to normal, then algae would return. Noticed that on top step I was getting what started as a algae that had the appearance of Guldens mustard (yellowish-brown) thin line about a foot long, that would reappear first at the exact same spot. Brush it away and in an hour or so it was back in the same spot. After reappearing, then the algae would start to bloom on pool bottom and sides as a green algae. After the second or third slam it turned to a more burnt orange color. I assumed that this is mustard algae, and shocked to the appropriate levels, but it just won't go away for good. Any suggestions?
PH 7.5 before slam process was started