When treating with aa how much does water temp effect the results. I am working on some two year old stains I have added 10 lbs of aa it seems to be working but it is slow. It is a 40000 gal vinyl pool. Can i just leave it on circulate until the stains lift? Will the aa stay effective for a few days? My chlorine was at 0 when I started. I don't care what the pool looks like it is too cold to swim at the moment. Will the ascorbic acid stay present if I simply let it circulate? I have seen some positive signs but in general the rust does not seem to be coming off the liner very quickly? Any advice would be appreciated.