A Pro Clear Wet/Dry filter is just what your tank needs to enhance your aquatic ecosystem. Give both your mechanical and biological filtration a significant bump in performance, while cutting down on maintenance needed for your tank. Wet/Dry filters work by slowly running water over a biological media that colonizes beneficial bacteria and allows your tank the ability to properly break down harmful chemicals such as nitrate. They do a superior job to canister filters because of a greater surface area and a more hospitable environment for beneficial bacteria. All Pro Clear wet/dry filters are back by an industry leading Lifetime Warranty. With outstanding customer service and superior build quality, Pro Clear should be at the top of every freshwater hobbyists wish list.