Our wash machine pumps water directly into our sump pump. Whenever the wash machine runs, there is a STRONG odor in our house of sewer\crap. The smell comes only in the bathrooms. IF we keep those doors closed, it's not so bad. Is there a trap that opens when the sump pump runs? I have run the sump pump at other times (not as long of pds) and it does not smell when it runs for short pds. So, I was wondering if the smells has something to do with the wash machine??