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There are a variety of inserts that can be used in a hang on filter. With sponges for mechanical and carbon for chemical filtration being the standard on most brands, there are also some that utilize ceramic beads or Bio-wheels to aid in the bacterial filtration process. Easily replaceable inserts allow you to keep your filter clean at all times. Other medias and resins such as Chemipure, nitrate or phosphate removers, can be placed in the filter for extra filtration if needed. With a variety of inserts available, you are sure to find the one for all your aquarium needs.
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