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Overflow Boxes
A built-in overflow is the most efficient method of draining aquarium water to a filter. If your aquarium does not have built-in overflow, CPR Continuous Siphon Overflows/Prefilters are the best means for getting water from an aquarium to a filter system without expensive modifications to the tank. They quietly skim up to six times more water than units with tubes.
The advantages of CPR Continuous Siphon Overflows/Prefilters include:
Adjustable water level allows you to easily change the level in your tank.
Black top reduces algae growth.
Plastic screen to prevent fish loss.
Quiet operation.
We highly recommend using the Aqualifter pump, available on this page, with your CPR Overflow.
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