Externally located filter provides for easier access, less time to clean,
isolated from pond and tends to be more aerobic.
Pump is not bogged by large surface area intake
screen. Resistance of flow to pump is on the discharge side of the
pump.
Liner under waterfall and border edge rock contains water.
Straighter sides and greater depth reduces predation provides shadowed
areas
Greater depth increases volume, reduces temperature fluctuation. |
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