I'm glad you'rs went so easily. I can speak from experience that not all do. I can't tell you why, because I've no clue. Mine was full-grown bitch, though.I'm surprised so many had a problem. It's really easy to get the filter off if you use an adjustable wrench and squeeze down until the outer edge of the filter crushes a little bit, then start turning. Gotta have some good muscle in it, but turn slowly at the same time, this way the filter won't tear as you twist.