Have you tried a rolling boil with filter in large pot with permeate or house water for a few minutes?
I had same problem 5 or so years back.
I do at end of season, they look like new no stains.
2020 same
2019 RB10 26 taps
2018 RO Bucket RB5 taps 20, leg tank in shed w/2 5/16
2017 18 taps
2016 20 taps
2015 21 taps
2014 30 2 gravity line, 2 hotel pan concrete arch 35 g leg tank
2013 LP hook up in shack buckets 12 taps
2 burner cook top 2012 finisher on a bbq tanks
2011 rookie 2+ gal
8 taps w/ milk jugs
turkey cooker
50-60 up back maybe
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