I need help. I have treated my vinyl liner pool 3 times now with AA in the last 3 weeks. Each time the stains vanished but have come back within a week when I start to raise ph and chlorine. 1st 2 times water turned milky. By filtering and back washing I got it to clear up but then the stain returned. I have been using Metal Free as my sequestering agent and wonder if this may be the problem. I am about to AA treat again and am seriously considering draining the pool 15,000 gallons or at least 1/2 of it while I have the staining sequestered in the water.
Any idea as to why the stain is coming back so quickly?
Also after 2nd treatment I change the sand in my filter to Zeolite sand. I then did the 3rd treatment Again the staining dissappeared. I added the metal free. Pool stayed clear this time and did not turn milky. I thought I had won!!! Nope , week later as I began to raise ph and FC stain came back. Pretty much on entire liner but worst area is where the first port off filter back into pool returns water into the pool on the shallow end.
This stain is driving me nuts and killing my wallet!!