A clogged overflow drain can contribute to a standing water problem. [6] X Expert Source David BalkanProfessional Plumber & CEO of Balkan Sewer & Water Main Expert Interview. 29 April 2021. Not all drains have a corresponding overflow drain. If there isn’t one, disregard this step.
Patience is key when plunging. It’s rarely a fast process, but it is an effective one.