Evaluate your situation Find the affected drain and extent of backup Check if many drains are impacted (implies principal line issue) Hunt for visible drinking water damage or overflow Standard DIY Measures Pour boiling h2o down drain Use plunger appropriate for sink/bathroom Check out baking soda + vinegar Remedy Take https://www.kawatan.net/how-to-find-emergency-drain-cleaning-and-plumber-services-in-etobicoke/