Hello all...last season I began using TFP as a resource with a Taylor test kit. After two previous years of inconsistent pool maintenance, I have what appears to be iron staining on a 30K vinyl liner. The stains came in last year, but I never dealt with them (I am a pool slacker). I have dropped my FC to 0 and pH to about 7.3 along with a Polyquat treatment. I started AA treatment about an hour ago. First 2.2 # container in the pool-stains lifted well in certain areas, but there is a large amount of staining throughout the pool. It seems like where there was good contact, the stain lifted, so I moved my jets around (no bottom main drain) to force contact with the stained areas with limited results. I added a second container of AA after about 30 minutes, again with limited results. Currently still circulating the water, but now I am out of product. I didn't think I would use more than 5# for 30K gal, but here I am. Unsure if I should go ahead with the sequestering agent or try to get more AA asap. Any suggestions? Thanks.