Resun CY-20 Compact External Filter

The Resun CY-20 is a small external filter for nano aquariums. Besides filtering the water, it also cleans the water surface and aerates the water.

The filter is intended for a small aquarium. As it sits outside the tank, the whole interior stays free for fish and plants and the look of the aquarium is not disturbed.

The water passes through several stages in the filter. Mechanical filtration is done by a foam sponge, biological filtration by ceramic rings and chemical filtration by an activated carbon filling, which according to the product data removes unpleasant odours and discolouration from the water.