I have been fighting mustard algae this weekend. I superchlorinated with bleach enough to raise FC to 24, and kept it there all day yesterday and last night. My CYA was tested at 0 before I began, and I haven't added any. (We haven't had any sun in three days, so I didn't worry about the CYA.) Just 6% bleach. This morning my water is no longer green, now it is a milky, almost sky, blue. How much longer do I need to keep the chlorine at shock levels? And, what's next? I was thinking of adding triclor next after the FC drops to swimmable levels, to get some CYA in the pool. Is that a good idea? Pump is still running. I have been backwashing about every 12 hours. This morning, the backwash was almost clear in the sight glass, even though I still can't see the bottom of the pool. Unless you say otherwise, I be adding another three 182 oz jugs of bleach after work this afternoon.
FYI, I forget my basic premise, but the pool calculator told me that at one point I needed about 5 pounds of triclor or 12 jugs (96 oz) of bleach to achieve the same result on FC. I priced the equivalent amounts at WalMart, and the total cost of each alternative was within 75 cents of each other with the bleach the lower price. Since triclor already has the CYA in it, does it really make sense to use separate bleach and CYA? Or maybe I am mistaken about triclor having CYA built in?