Melton Fox
Dancing Queen
I'm guessing you've got a Juwel Vison 260. If so you just need to replace the pump, or the air pump if you have one.Snap, mine's 260ltr as well. At first it seemed to dominate my office. Used to it now though, noisily chuntering away in the corner.
Most aquatic shops will stock the pump required for any Juwel filter