Figure 64: Detail of the top of an experimental flow-through tank showing the “banjo” filter
(BF) attached to the out-flow pipe (OF). In this example, seawater filtered to 1 μm by a filter
cartridge (CF) is supplied to a gravity tank (GT) from which it flows at a controlled, constant rate
into the base of the larvae tank. Food is drip-fed into the tank from an algal reservoir (AR). The
“banjo” filter is made from a 20 cm diameter section of PVC pipe and is fitted both sides with
60 μm nylon mesh screen, solvent cemented to the cut faces of the cylinder. A short length of
suitable diameter PVC pipe is welded into a hole drilled through the plastic to connect with the
out-flow pipe. Large diameter “banjos” are recommended to reduce the per unit area force
generated by the out-flow. They should be totally, or almost totally, submerged and need to be
cleaned daily. For this purpose, the “banjo” is a push-fit into a swivel coupling (SC) made from a
pair of 90o PVC elbows. This coupling can be swivelled upwards to raise the filter above the water
level for removal and cleaning, or replacement.
Figure 64: Detail of the top of an experimental flow-through tank showing the “banjo” filter
(BF) attached to the out-flow pipe (OF). In this example, seawater filtered to 1 μm by a filter
cartridge (CF) is supplied to a gravity tank (GT) from which it flows at a controlled, constant rate
into the base of the larvae tank. Food is drip-fed into the tank from an algal reservoir (AR). The
“banjo” filter is made from a 20 cm diameter section of PVC pipe and is fitted both sides with
60 μm nylon mesh screen, solvent cemented to the cut faces of the cylinder. A short length of
suitable diameter PVC pipe is welded into a hole drilled through the plastic to connect with the
out-flow pipe. Large diameter “banjos” are recommended to reduce the per unit area force
generated by the out-flow. They should be totally, or almost totally, submerged and need to be
cleaned daily. For this purpose, the “banjo” is a push-fit into a swivel coupling (SC) made from a
pair of 90o PVC elbows. This coupling can be swivelled upwards to raise the filter above the water
level for removal and cleaning, or replacement.
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