Assess the problem Find the affected drain and extent of backup Verify if multiple drains are influenced (signifies primary line issue) Try to look for seen water destruction or overflow Primary DIY 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/