Evaluate the specific situation Locate the afflicted drain and extent of backup Test if a number of drains are affected (suggests primary line difficulty) Hunt for visible drinking water damage or overflow Primary DIY Techniques Pour boiling water down drain Use plunger appropriate for sink/rest room Attempt baking soda + https://www.kawatan.net/how-to-find-emergency-drain-cleaning-and-plumber-services-in-etobicoke/