How To Make A DIY Hang On Back Filter
(Complete list of parts at the bottom of page)
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This DIY hang on back filter is a great build for smaller aquariums. Its not the easiest aquarium filter to make, but if created properly, can last for several years.
Traditional "HOB filters" are designed for mechanical filtration and typically only have a small biological step which we want to maximize. This design changes the primary function of the filter to provide an unmatched amount of biological filtration while the input of our HOB handles the mechanical step.
The setup of this DIY HOB filter is tailored to match the output of a relatively weak powerhead (~200 gph) but a stronger pump will only increase flow and work better on tanks larger than 20 gallons. There are a few simple modifications that will allow the this HOB to be compatible with larger pumps and we will be making a video highlighting how to do so.
DIY HOB Filter Complete Part List: