Assess the specific situation Find the impacted drain and extent of backup Verify if multiple drains are afflicted (signifies primary line issue) Try to look for seen water destruction or overflow Standard DIY Techniques Pour boiling water down drain Use plunger suitable for sink/toilet Test baking soda + vinegar Remedy https://www.kawatan.net/how-to-find-emergency-drain-cleaning-and-plumber-services-in-etobicoke/