I do not know about the problem, could be but the recent purchase of the canister filter made me call them a couple times during the installation as I am not mechanically inclined and they spent a long time with me and no complaints with it at all. I should not have needed as much time as I took as they sent along a lot of instruction but after the fiasco with EHEIM I did not want to take chances. I was really impressed. But then I did not need parts in fact had more parts than I needed in the box.

Rose