I have bubbles coming out of both return lines and I am not loosing water. My clear pump trap lid seems to be bubble free. When I shut the pump/filter off, My water level goes down to low in my pump trap to even try to backwash. I have an older pump. I can't find any spots that are leaking water while it is running. Help! I have noticed water squirting out of my pump trap drain plug when I turn the system off for a few seconds.