Have you tried actually taking the filter apart, cleaning the impeller, housing and all?
A lot of times hair and other crap can get wrapped around the impeller, or sometimes they just fill with up with normal detrius and will start pumping again once the impeller is clean and the hole where the impeller goes is free of debris.
Might be a little late but I have experience with these filters I would try piling the impeller out and take a q tip or 5 and clean out the inside where the magnet gos it gets gunk in it sometimes and clean the impeller shaft then put a little bit of water in and plug it in after u install just the impeller and see if it's spinning if it is put it back together and prime the filter then stick the media back in
Thanks! I appreciate the back up
Smile, it makes folks think that you're up to something.
Only thing I can say to do at this point is to keep adding water I add it till it comes out the filter and keep adding and did the base of the intake seat all the way down they can be a little stubborn sometimes