05-10-2010, 12:15 PM
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IF you purchased "used" from your local area, you have a chance to inspect the unit. The advise I give to newbies in any hobby when purchasing used is to use the "puzzled look" when purchasing. So lets say a fellow is selling his Eheim used 2217. You go to his home and ask him to fill the canister with water and plug in the unit for only 30 seconds - remember he doesn't know you don't have a clue what to look for. After the filter has run for 30 seconds get a kind of puzzled look on your face. If the guy is trying to flog junk and has a guilty conscious about it (the average person), he will start explaining away a problem you didn't see or hear, but he thinks you have.
There's not much to a canister filter, its basically a "fat" tube with an intake and exhaust outlet for water and a motor & impeller to move the water through; so does the motor move the water, if it does the filter should be good.