Serviceman worked for hours trying to clear sewer clog. Thought he would have to end for the day and come back next morning, but just at the last moment, the clog cleared! He worked so hard, was so concerned that he wasn't going to be able to finish the work for me. He apologized! Then, success! I call Sullivan whenever I need their expertise and they have always come through. They've done a lot of great work for me previously and so I would, of course, recommend to anyone who asks.