Filter is no more than a container for the air lift and the 'three layers'. It can be hung inside or outside the aquarium, depending on its size. The amount of work it can do is governed by its own area and by the rate of the water filtering through it.
The first layer of the filter has to be renewed most frequently, bearing as it does the brunt of the work by removing the larger floating particles. The sides of the filter, if it is being hung outside the tank, should be shielded from excess light, as should all connecting tubes, so as to discourage the formation of clogging algae.
The three layers must, of course, be packed down tightly so that the water has to percolate through and cannot run down quickly. Obviously too the layers will have to be of a reasonable area and of a sufficient thickness.
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