For a hob? Well I got a 9 year old penguin chugging along right now. Does it filter as well as an aquaclear? Mechanically no but provides plenty of bio and moves water.
LOL,wouldn't that be something?....I have smaller AC filters that are not being used currently but my larger filters are Emperors.I get good mileage out of the filter cartridges by giving them a good weekly rinse and I change them when they are basically falling apart.I'm actually waiting for some filter maker to pull a Kuerig and "chip" their cartridges in some way, so that you can only use genuine cartridges in their filters.