I have a rotten egg smell coming out of my bathroom sink drain. Also sometimes when I do a load of laundry the smell comes out of my bathtub, bathroom sink, and kitchen sink and the whole house smells. We live in the country in a trailer house. We have city water. We also have what we call a gray water line. Thats what my machine water drains into. The smell isn't everyday. It just happens at random. Please help?