We had a problem with the smell of sewer gas in our home. Before anyone came to look at the problem I tried a solution I found online. The smell was gone but I wanted to make sure the problem would not recur. They came and told me I did the right thing, checked out my sewers and explained what could have been the cause of the problem and how to make sure it doesn't happen again. I expected to pay the service call fee. He said no charge, which was greatly appreciated as I am retired. Any plumbing problem I have, they will definitely get my business in the future.