First of all thank you to everyone who has pool problems! (and answers ) The pool store people make you feel like an uneducated jerk when you ask them anything....
Last year you helped me clear some nasty iron stains from my tea stained liner. Put in new sand and shut 'er down for the winter. This year I pulled the cover from my pool in April, liner was mostly fine, water was slightly cloudy buy no green and some debris on the bottom. I started the filter, vacuumed the pool, backwashed and pretty much left it circulating on filter for about a month until I was ready to balance.
CH 0, PH 7.1, ALK 80, CYA 0 (fishy since last season the pool store said it was 300 in August)
So I figured what the heck, while the CH is at zero, might as well finish off those remaining stains. I used the AA method, added Jacks Pink, liner was beautiful for a whopping 2 days. The minute I poured any bleach in the third night, the next morning my liner started to turn. So I added more sequesterant and waited another 2 days to add more bleach. At one point, I think the third cycle, I said the heck with it, I need chlorinated or we can't swim over the holiday. So in 6 weeks, I have been through 4 pints of AA, 1 pint of Oxalic Acid, 8 pints of pricey Jacks sequesterant, and a whopping 60 bottles of bleach Clorox brand. I am not counting the muriatic acid and cyanuric acid since I don't think that's my problem here.
So I guess after I wrote this book my question is - how can I get to shock level with my chlorine without dissapating all of the iron onto my liner? My PH is 7.1, ALK 80, I am religious about those levels, but....All that Clorox, and my FC is .5 and my CC is .5, and I am so invested now, I want to win the stain battle!!!!!
Things I know about my pool - vinyl liner, approx 28000 gal, sand filter, in-line vacuum, and would make a better garden filled in!