How do I unclog a clogged swimming pool vacuum?
You'll need an auger to clear the clog in the pipes:



Loosen the clamp at the metal end and begin inserting the snake (metal coily wire) into the pipe until you hit the blockage (or get stuck in a corner).  

Tighten the clamp and turn the plastic handle to spin the snake.  That will help penetrate the blockage (or realign the snake to get it around the corner).  

Extract the snake, clean the end off removing the gunk it collects, and repeat until you stop getting more gunk and the water flows through the pipes again.