Assess the problem Track down the afflicted drain and extent of backup Check if various drains are afflicted (signifies principal line problem) Try to find visible drinking water damage or overflow Essential DIY Steps Pour boiling drinking water down drain Use plunger suitable for sink/toilet Check out baking soda + https://www.kawatan.net/how-to-find-emergency-drain-cleaning-and-plumber-services-in-etobicoke/