Whisper Power Filters are the best-selling brand of power filters in the U.S. Appropriate for every size aquarium, they provide the three types of filtration that your aquarium needs: Mechanical Filtration -- To remove particles such as uneaten food, bits of plants, fish waste, etc., from the water. Biological Filtration -- To provide for the growth of a colony of beneficial bacteria that will eliminate harmful toxins in the water.
Chemical Filtration -- Activated carbon removes compounds that cause odors and discoloration of the water.
