Assess the problem Find the impacted drain and extent of backup Examine if several drains are affected (implies major line problem) Search for obvious water destruction or overflow Standard Do it yourself Measures Pour boiling h2o down drain Use plunger suitable for sink/rest room Attempt baking soda + vinegar Resolution https://www.kawatan.net/why-you-should-never-use-baking-soda-and-vinegar-to-unclog-a-drain/