My hayward xstream recently started sucking in air. I just put in a new cartridge but I don't think this should have caused the problem. I can't figure out where the air is coming from. I have filled my pool to the top and no air is coming in through the basket but yet there are alot of bubbles in the clear top in the the pump. I am constantly having to release the air through the air flow valve. I am afraid to leave the pump running when I am gone. Any suggestions.