The plumber was very nice and truly felt bad that he good not find a reason for our issue and left with it unresolved. However, that was quite disappointing. Furthermore, my husband later snaked the drain, pulled out a HUGE mess of stinky stuff and the issue was resolved. Why didn't the plumber try and snake the drain or clean it out? Very upsetting and costly. They did come out Pronto, but an hour and half later, no resolution and a few less dollars in my bank account.
