Assess the problem Find the affected drain and extent of backup Examine if multiple drains are affected (suggests main line difficulty) Try to look for obvious h2o harm or overflow Primary Do it yourself Steps Pour boiling water down drain Use plunger suitable for sink/rest room Try baking soda + https://www.kawatan.net/how-to-find-emergency-drain-cleaning-and-plumber-services-in-etobicoke/