I tried to vacuum the pool but had problems. The pool company did no leave behind any books or papers. I had to download from the internet information on the pump and filter to know how to get it started. What I tried was to fill the hose with water from the return jet. I put the smaller lid over the skimmer basket and the hose to it. It would create a vacuum for a short time and then the lid would pop off the skimmer basket. Any ideas what I am doing wrong?