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I purchased the Aquatop PF3 to replace a single element filter. This one by far is a better filter. It has a dual element filter housing which gives not only your standard mechanical carbon filter, but also has a biological treated element. There is also enough room in the filter housing to add an additonal carbon pad, or even small bio filter elements if you wanted. I've only had this filter for a couple of weeks, but it seems to be working well, and I can tell you it "does" move some water. So this tells me it is doing a great job at rotating the water, as it causes a great current flow through the tank. I would recommend this filter to anyone.