Evaluate the Situation Find the affected drain and extent of backup Look at if various drains are influenced (signifies primary line issue) Hunt for noticeable drinking water problems or overflow Simple DIY Measures Pour boiling drinking water down drain Use plunger suitable for sink/bathroom Consider baking soda + vinegar Option https://www.kawatan.net/how-to-find-emergency-drain-cleaning-and-plumber-services-in-etobicoke/