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A filter keeps the aquarium clean and fresh and contributes to a healthy water quality. Waste materials travel through the inflow to the filtermedia and are filtered. An external filter can be placed out of the view and is easy accesseble for maintenance. This is a great advantage compared to an internal filter.
Dennerle Scapers flow hang-on filter has everything a hang-on filter needs. A solid filter that also looks nice, is affordable and offers a good solution for smaller aquariums that cannot be connected to an external pump.