Generally speaking, it would be better to call for a professional when you have to unclog the sewer pipe or when there are issues with the same.  You must therefore call for someone who has expertise and experience in sewer drain cleaning. ​ Source: https://www.storeboard.com/blogs/products-and-services/how-to-clean-the-sewer-on-own-when-there-is-no-plumbing-help-available/5514869