HOB filters last anywhere from several months to a couple years depending on their quality and how often you clean them. These filters will eventually wear out, but when that happens it's pretty easy and inexpensive to replace them! Marineland Penguin 350 Power Filter is one of the most durable and long-lasting hob filters on the market. It comes with a three-year warranty and is designed to last for up to two years before needing a replacement!