With a used filter, the first thing I do is find the manual and parts list online. If the parts are mostly there and the motor hums or vibrates, I order replacements for missing parts and new gaskets. Where I have new gaskets, I put it together and test in the sink. I still manage floods with filters I've had for years. I knock a valve off a hose or just forget to close one. This is the major drawback of canisters, IMO. It teaches you how to clean up water fast. lol. Hang in there.
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