I'm new at pool cleaning. I need to understand how to vaccuum my pool. When I attach my vaccuum hose to the vaccuum head and put it into the pool, some of the hose is submerged and filled with water, but a large portion is not. This potentially introduces a lot of air into the circulation system. How do I eliminate the remaining air in the hose? Is there an easy way to do this? Do most pump systems just work after you introduce all of that air into the system?