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Hmm a little concerned about my new (second hand) Eheim 2317 filter.

If you are happy with the reply then stick with it. I would just call John Allen aquariums (eheim uk distributor) and question the impeller. All my eheims have had a six blade version so just check the 3 blade one is correct.

From what I understand the 2215 is identical to the 2217 impeller, except for the no of fins. So it looks like the previous owner put a 2215 impeller in it. As I have an old 2217 impeller kept as an emergency spare (chipped magnet hence noisy) from my other filter, and the plastic fins easily come off, I should be able to put my 6 fin on there. Not trying until I decide to keep it just incase I break anything 🙂