My Clean & Clear's core broke. The tower piece, that has all the holes in it, broke away from the base that tower snaps into. I can't get the base piece out from the bottom of my filter. It's in there really tight. I've pulled with all my might and it won't budge. Is there a trick to pulling it out? If I can't get it out I'm thinking I'll need to break it into a few pieces to get it out. Is this safe or common to have to break it? If I need to break it I'd appreciate any advice on what kind of tools and methods might work best. I don't want to break something else in the process. Thanks!