return pump gph

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jbeatts

Aquarium Advice Apprentice
Joined
Apr 9, 2019
Messages
29
Location
California
How do I calculate the gph my return pump needs to be? I am going to be using an overflow box to connect the sump.
 
No, if the return pump is dialed back by a gate valve that you plumb after the pump. This way you can match the GPH perfectly. The overflow having higher GPH will lead to the water level in the tank dropping below the overflow and lead to siphon loss. This will lead to your return pump emptying the third section of your sump into the display tank and overflowing the system.
 
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