A sewer line blockage can be an, smelly, and expensive mess. Once there is blockage, you might quickly smell the foul odor or see water leaking..How to Unclog a Main Sewer Drain. If your home has more than one clogged toilet, bath, shower or sink you may have a clogged main sewer drain.This condition can cause a foul smelling mess if plumbing fixtures upstream of the clog continue to be used and sewage begins to flow out of lower lying drain openings inside your home..Unclogging the main sewer pipe can be a bit difficult, but with the help of a couple different tools, you should be able to get the job done. The two techniques we’ll describe in this article should be enough to unclog the drain of most sewer pipes, but in some cases, you’ll need to in a professional Fullerton plumber to help you..This disambiguation page lists articlesociated with thele Septic. If an internal link led you here, you may wish to change the link to point directly to the intended article..