What is a pool vacuum leak?

A pool vacuum leak could mean that there is a leak in the vacuum hose that you use to vac the pool. Or it could mean that there is a leak on the suction side of the pump. It could be located somewhere between the skimmer and the inlet of the pump. At the pump it could mean that there is a leak at the pump seal or the pump lid or a pump gasket. Some of these leaks will not produce water at those leaks they may only suck air into the system. k