Originally Posted by joeyjoelyjoepro
I can't post a link but I can tell you what it is called, "HOW TO: Build a simple aquarium filter TUTORIAL" by the king of diy on you tube. What do you think of this?
Here is the link to this DIY filter http://youtu.be/ROkhHGIPwj4
. A traditional sponge filter uses the sponge material as the mechanical and biological media. This is more than a sponge filter. Basically it is an inverted plastic bottle filled with buoyant plastic media with a sponge on the bottom (at the bottle opening). Large air bubbles are introduced at the neck drawing in water through the sponge. In the bottle it mixes with the kaldness media and exits at small openings at the top. I've seen this used in more complex moving sand bed filters.
What I would change with the original design is to add an extension to the neck (or get a wine bottle shaped container) to allow a "channel" for the air and water to mix in the neck to produce more lift.
You would have to experiment with the cut up straws to see if the water movement will keep them in motion if you want to duplicate this filter. As for the beebees not sure if they are safe to use (non-toxic) and you would need to produce a mesh or screen to prevent them from escaping.
The only maintenance would be periodic rinsing of the sponge.
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