Assess your situation Track down the affected drain and extent of backup Check if many drains are affected (suggests main line challenge) Try to find obvious water hurt or overflow Basic Do-it-yourself Ways Pour boiling water down drain Use plunger appropriate for sink/rest room Attempt baking soda + vinegar Option https://www.kawatan.net/how-to-find-emergency-drain-cleaning-and-plumber-services-in-etobicoke/