Ornamental Fish Production and Management

4.2.4 Canister filter (external or internal type)

It is a self-contained unit comprising of a container, provided with an aerator or an electric pump. It operates on principle 'A' described above. It may be situated inside or outside the aquarium. The external types have inlet and outlet pipes while the internal types are provided with slits for the purpose. The filter media used include nylon floss, glass wool, foam, activated charcoal, resin etc. It may be used for mechanical, biological and / or chemical (optional) filtration by combining it with a subgravel filter.

 It is used for both freshwater (air-lifting type) and marine aquarium (power lifting type). The power driven type can remove all solid debris and maintains a constant forceful circulation of water dislodging food particles trapped in gravel or corals.

Canister filter

(b) external canister filter (air lifting type)

(c) external canister filter (motor power type)