Aqueon QuietFlow E Filter 20 Gallon

Economical efficient and easy to use describe this internal power filter. For use with frameless or framed aquariums. Easy to position with suction cups or clips to attach and hang on the aquarium rim. The filters provide chemical biological and mechanical filtration. Includes: Carbon Cartridge - chemical filtration (odors and discoloration); Bioholster - biological filtration (toxic ammonia and nitrites); Course Media Sponge - mechanical filtration (particles and debris).