Assess the specific situation Locate the afflicted drain and extent of backup Look at if many drains are impacted (implies major line problem) Look for seen water problems or overflow Simple Do it yourself Measures Pour boiling h2o down drain Use plunger appropriate for sink/bathroom Try baking soda + vinegar https://www.kawatan.net/how-to-find-emergency-drain-cleaning-and-plumber-services-in-etobicoke/