Aquarium filters convert water pollutants through bacteria which collect on the filter material. This information is important so you understand why you do not have to clean the aquarium filters too often! In fact, frequent cleaning would cause an imbalance in the bacterial culture and hence affect their cleaning and filter performance. Oxygen is also fed into the aquarium water through the filter pumps.
Filter systems:
Exterior or interior filters. We recommend using two interior filters to have a backup and to improve the quality of the water. Exterior filters are connected via tubes and therefore are placed outside the aquarium. There is a risk of a tube coming loose or a filter starting to leak. This could cause the aquarium to leak dry. This risk can be avoided by using interior filters.