An aquarium filter is a mostly essential device that helps keep the water clean and “healthy”. However, there are different types of filters that are suitable for different aquariums. An important decision to make is whether you need an internal or external filter and what size it should be.

Internal filters are the most common type of filter used in aquariums. They are placed directly in the aquarium and suck the water, filter it and then pump it back into the aquarium. This type of filter is easy to install and maintain, and is best suited for smaller aquariums or aquariums with only a few fish. In addition, this type of filter is safer because no water leaves the tank and therefore nothing can leak.

External filters are another type of filter that can be used. They are placed outside the aquarium and suck the water from the tank, filter it and then pump it back into the aquarium. This type of filter is best for larger aquariums or aquariums with a lot of fish, as they have a larger capacity and can filter the water more effectively. In addition, they are also more visually attractive, as only the inlet or outlet are visible.

When choosing an internal or external filter, it is important to select the right size for your aquarium. As a general rule, a filter should have at least two to three times the flow rate of the aquarium’s water volume. Thus, a filter suitable for an aquarium with 100 liters of water should have a flow rate of at least 200 better 300 liters per hour. In addition to the flow rate, attention should also be paid to the filter volume. For example, this should be 1.5 liters for a 100 liter aquarium. This ensures that the important bacteria have enough space in the filter.