Filtration For an optimally functioning and clear aquarium, filtration is one of the most important points. The filter is usually divided into different filter compartments, each containing a specific filter mass. The filter mass is important so that the bacteria can settle in the filter. We distinguish four types of filters: Biologist, Sump, external outside filter and the filter in the aquarium (internal). A biologist or sump are filters that are placed under the aquarium or in another space.

A sump is named for a marine aquarium and a biologist for a freshwater aquarium. A biologist is a biological filter and is based on the ability of positive bacteria that are responsible for removing negative bacteria.

A biologist is divided into different compartments and equipped with a perforated plate to keep the filter mass in place. When the water has been filtered through the different compartments, the water is pumped back into the aquarium. You can also incorporate technology such as: heaters, pumps and digital meters into the biologist. The ratio of aquarium water capacity to filter is 20% of the aquarium volume. A sump is the central point for the filtration of a seawater aquarium. It is a very important part for a well-functioning aquarium. In a seawater aquarium it is important that you have enough water volume to obtain stable water values. It is important that you do not place a lot of filter mass in the sump, after a while you will create "nitrate factories" (accumulation of waste products).

The best method is to place a pre-filter in the sump (filter fleece pre-filter), then some live rock so that the bacteria can settle in the sump. And a well-functioning protein skimmer that can quickly filter the entire contents of the aquarium. Finally, a powerful feed pump that pumps the water back into the aquarium.