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The
filter is a plastic plate with holes, that sits just
off the bottom of the tank. It is covered with fibreglass
mesh that supports a layer of gravel.
The
plate has one or more airlift tubes. A small blower
provides a stream of air bubbles up the tubes to pump
and circulate the tank water through the gravel bed.
A
range of filter and air equipment can be found in any
aquarium shop. An undergravel filter will cost between
approximately $10 - $50 depending on the size of the
tank. |
