Evaluate the specific situation Locate the afflicted drain and extent of backup Test if several drains are affected (suggests primary line difficulty) Seek out visible drinking water destruction or overflow Standard Do it yourself Measures Pour boiling h2o down drain Use plunger appropriate for sink/bathroom Try baking soda + vinegar https://www.kawatan.net/why-you-should-never-use-baking-soda-and-vinegar-to-unclog-a-drain/