Simple really tried all the filters, Best Hangon aquaclea.r best Canister Eheim, more money intially but I have had eheims running foir twenty years w/o one issue, Aquaclears for ten w/o one issue. all the others pale in comparison, I wasted the money on lots of crap before I learned of these filters. I threw a magnum out a three story window after it leaked for the third time and NEVER looked back Good luck.