Submerge the vacuum head in the pool, grab the hose, and submerge it into the pool in a way that would not trap any air. Once the end of the hose is reached, hold the end slightly above the water ...

it's because something is stuck in the filter or hose somewhere,' explains pool expert Rafi Friedman. This is usually a pretty easy fix – all you have to do is take the vacuum out of the water ...