I bought some fixtures about 18 months ago. American Standard. Got them to upgrade our Master Bath sink and toilet. I have never done any darkroom work in there. The chrome is starting to corrode. I think that the lower priced fixtures are just not as well made as we'd hope. I am sure it has nothing to do with your darkroom work.
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I learned about American Standard the hard way, too. We built our house in 1993 using all AS fixtures, except for one small "bar sink" in our kitchen which has a faucet made by Grohe. Grohe is good German stuff (Think Leica, Rollei, Zeiss!!), and the sink has never, in 13 years, needed as much as a washer.
The American Standard faucet in the main sink lasted less than 5 years, and I replaced it with a Grohe. End of maintenance on sink.
The AS faucets in our bathroom have gone through endless replacements of special, AS-only washers (at about $15 or more each!), as well as the removeable seats that they seal against ($10 per pack of 2). Handles have broken ($20 each). Everything else is basically falling apart. The worst part is that the local dealer rarely has the parts in stock, and they have to "special order" the parts, which take several weeks to arrive, and then they don't bother to call when they do.
If I could afford the labor, I would replace every fixture in this house with Grohe. American Standard sets a pretty damn low "standard," in my opinion.