Evaluate the problem Track down the impacted drain and extent of backup Check if several drains are afflicted (indicates principal line challenge) Try to look for visible h2o injury or overflow Basic Do it yourself Ways Pour boiling h2o down drain Use plunger appropriate for sink/toilet Consider baking soda + https://www.kawatan.net/how-to-find-emergency-drain-cleaning-and-plumber-services-in-etobicoke/