Interesting development... I never smelled any sulfur from my taps. Yesterday I was changing out a keg. I did a PBW flush, then a star san flush. Usually I then put the new keg inand pull beer through it. But yesterday I left it alone, with the star san in the line for a few hours. Sur enough, when I went to drain it... sulfur smell. No doubt the acidity is the issue.
Which leads me to the next question... is your beer possibly too acidic? Have you measured it? This tap had a hefe though it, and I never smelled sulfur before, but maybe some beers are on the acidic threshold to pull sulfur out?
Either way, this is a problem that Perlick needs to address.
The IPA I did the original testing with measured pH 4.45 (post #68), but that keg kicked some time ago.
I have a BoPils on my third faucet right now (most recent treatment: full AAA passivated with phosphoric), as mentioned before that faucet (it's a A0915G) is no longer kicking sulfur.
I have a Porter on my second faucet right now (full AAA passivated with citric), also as mentioned before that faucet (it's a A0915G) is no longer kicking sulfur.
I have a Rye Amber Ale on my first faucet (most recent treatment: full AAA passivated with Star San analog as the acid), and that one (it's a A0815G) is still giving me the faintest whiff of sulfur on that first draw, even through a lot of Columbus and Centennial hops. It's so faint and fleeting that if this was in a commercial, "being pulled constantly" setting I'm sure no one would notice it. But still not fixed as far as I'm concerned. Call this my promised update.
I should get pH on all these beers.
Still thinking I need to re-do full AAA passivation on that A0815G faucet, probably use citric on it, that might be the best treatment IMO. But then again, maybe A0815G was simply a particularly sulfury vintage, and just needs another round of passivation whatever the acid used.
It may also be that these passivations still haven't removed
all surface sulfur (from my A0915G's), but just enough that regular pH beer isn't bringing it out any more.
And as far as I can tell, Perlick ain't addressing s**t.