Resun Ef-2800 External Power Filter with ULitera-Violet Steriliser Output, 2800 Liter/Hour

This is one the most powerful canister filter I've ever owned, the output is simply insane! I'd have given it five stars but there are a couple of significant issues that you should be aware of. Firstly, priming is an absolute pain... It comes with some sort of priming syphon thing that doesn't really work so you're left with the old fashioned bucket method and a mouth of fish water. Second thing to be aware of is the trays. They're meant to clip together and be lowered into the canister in one go. However, once full with media the trays deform slightly meaning they have to be placed in one by one which is awkward as they don't have any handles. Otherwise, no complaints at all. It turns a lot of water over and is quite quiet (not silent but it's ridiculously powerful). It's doing a great job of keeping my 450 litre aquarium clean.