Can’t quite figure this one out.
I have a friend who owns a home that is approximately 7 years old. He has an odor he describes as slightly “sulfurous” that comes from ONE sink in his house. In particular it only comes when the hot water is running in that sink, and only for a short while (30 seconds or so). The smell does not remain once the water is shut off, and after running for 30 seconds, he can not smell it any more. I did an informal look at this house about a year ago when he bought it - there were no cross contaminations or signs of trouble (or diy plumbing)
Any idea what would cause a smell like that from only ONE faucet? Bathroom faucet, used several times throughout the day. The friend is also a clean-freak, so nothing obvious about dirty sinks .
Any ideas from you plumbing guru’s?