What could be causing the skimmer basket to become a geyser when the pump shuts off. Seems the pump basket empties completely of water and the lid to the skimmer is blown skyward along with a serious amount of water. Pump also takes a rather long time to prime. I'm getting nickel and dimed to death by pool companies. One replaced the O-ring on the pump lid ($60). Old Faithful still going off. Today, a different guy said it was the union. He replaced the union($190) but still, the geyser keeps going. One company said everything needs to be replaced, another one says "just need to fix the small leaks" and on and on. Also, the fiberglass sand filter is sweating. Has anyone ever had this problem?