**To operate the HMF filter with an air lift, you need an air pump (diaphragm pump), which is not included in the scope of delivery!

With the " Konkav-Line " filter series, Aquakallax offers you the world's first fully active space-saving HMF.

Danger!!! You can easily determine the appropriate height of the filter by measuring from the ground to the water line. When installed, the filter stands on the gravel/sand and reaches approx. 2 above the water surface.

The concave filter finder

Use our calculation tool to find the right filter for your aquarium.

Aquarium width (in cm):

Aquarium depth (in cm):

Aquarium height (in cm):

Height of the substrate (in cm):

Calculate

The aquarium has a net volume of approx. Liter.

From the ground to the water surface there are approx. cm.

The ideal height of your concave filter is : cm

Recommended filter leg length :

Does your aquarium have a net volume of over 200 liters or is it extremely busy? Then we recommend using two filters! This way we avoid putting too much strain on the filter and get a very long service life.

Product Information

Aquakallax®'s latest invention is revolutionizing the aquarium filter market.

Every aquarist knows and appreciates the excellent biological filter performance of the Hamburg mat filters.

The disadvantage of this filtering is the enormous space requirement.

So we have made it our mission to develop a filter that takes up less space in the aquarium without sacrificing biological filter performance.

After more than two years of development, we* have managed to achieve exactly that.

Information on filter performance ( Attention! Select your filter in the correct size and not based on the biological performance table! Please read our FAQ for how to determine the correct size.)

Other filter manufacturers rely solely on pump performance, but at Aquakallax we know that this alone is not enough to accurately determine filter performance. That's why we rely on information about the biological performance, which can determine much more precisely whether a filter is suitable for the aquarium or would be overwhelmed by the load.

Our filters are specifically designed to maximize biological performance and ensure your aquarium is always healthy and happy. With our focus on biological performance, you can be confident that our filter provides the performance necessary to break down harmful substances such as ammonia and nitrite, supporting healthy aquarium life.

The "Konkav" is delivered with a matching air lifter **ready for connection, equipped with the highly efficient air lifters of the GN series.

The pre-assembled check valve sits between the filter and the membrane pump to safely prevent the water from flowing back, even in the event of a power failure.

The selectable mounting variant