I had a stain in my pool, thought it was algae, did a shock treatment, had blue green water for 3 days, when it cleared up, turns out it was a stain that then spread to the whole bottom of my pool........
came to this sight for research before proceeding with anything else (after using this site to do the baquacil to bleach conversion a few years ago, no problems since)
Did the vitamin C test, postive, followed the directions for getting the pool ready for the the AA treatment, did the treatment last night, perfect pool this afternoon!! I am not sure how much of the sequestrant I am to put in now to keep from restaining, the monthly dose, or an initial treatment followed by monthly doses. Thanks in advance!!
18' by 52" above ground vinyl lining pool.