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Have yellow staining on vinyl...never had before. I have 24 ft round x 52" tall vinyl above ground pool with 16400 gal. Had water tested today using pool watch water analysis with the following results: total chlorine 6.0 free chlorine 5.9 ph 7.1 total alkalinity 71 calcium hardness 29...

16400 gal 24 ft. round vinyl pool by 52" tall. Hayward DE Filter 1 hp.