thanks to everyone for their help this year as we completed our new 28,000 gal gunite/plaster pool. as some of you know, i have some metal staining that i have now been able to identify using the jack's magic stain id kit. the kit suggests that i use their #2 solution, which requires the heater to be bypassed since it will take the ph down to 6+. so, jack's magic suggests that i add 3 qts of jack's magic blue before closing and then add another 3 qts when opening followed by weekly additions of approximately 1 qt in order to maintain 20ppm. i have been using another metal sequestrant from a local pool store, but it doesn't seem to remove the stain (large area surrounding my drains - spot treatment would be extremely tedious.) at this point, i'm trying to decide whether i should just close her up and then deal with this in the spring or if i would be better off trying to address now since i could keep things running for another few weeks.