Hey guys-new to the site, but have been referencing it for about a month to straighten out my pool. I have owned a 30k gal vinyl liner for 3 years and have yet to really dial it in. This is admittedly mainly my fault, as I have been a lazy pool owner, but I am turning over a new leaf. Now have a Taylor test kit, am trying to follow BBB, and putting the time into maintenance. Here is my issue: early in the season, my CH bottomed out to 40ppm, Cya was over 100. I was testing through a local pool store, and they made their recommendations to balance, but did not stress the dangers of low CH or issues with high CYA. Long story short-I have a vinyl liner that appears to have metal staining. I did try the pool stores metal stain removal process in the summer, to no avail. I have since turned my back on them and am attempting the fix myself, but could use some advice. Through the use of BBB and the pool calculator, my info is as stands: FC=0.2ppm CC=1.0 pH=7.5 TA=100 CH=190. I have been adding 8% bleach at levels recommended by pool calculator and have driven CC down from as high as 4.4, with FC regularly falling back to 0. Water looks good, but I need to straighten out FC/CC and get rid of the liner stain.
Now the question...should I superchlorinate as recommended in the Taylor handbook, should I SLAM as recommended here, or try to rid myself of the (maybe) metal stains? Help!