Hey y'all. Haven't posted in awhile but you probably knew I would be back A few years ago I noticed a couple of stains in the shallow end. They did not respond to Vit C nor pucks. With my pool surface I was the only one who noticed so I let it go. Probably should have added a sequestrant but that's hindsight Last year I noticed more and some on the side close to the shallow end return. Thought, O.K. better put a stop to this Knowing they didn't respond to either of the above mentioned I tried the AA treatment anyway. This was Wed. 4.5lbs AA, 18 oz. Poly 60. Nothing happened. Didn't even lighten them. I added 2 quarts of sequestrant Thurs. evening. Held a cut lemon on one of them for 30 mins this a.m. NOTHING. If is is cobalt staining, what will get rid of them?
My #'s this morning: