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Discussion Starter · #1 ·
I am building a sump for a freshwater aquarium and i have a return pump but how would water enter the sump at the same rate as the pump? if water comes into the sump with an overflow or intake how would i keep the sump full of water without the return pump draining the whole thing? do i need an intake pump?
 

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The overflow is gravity fed. As you add water from the sump into the tank, the water level rises, falls into the overflow and drains to the sump. The higher the water level gets, the faster it will drain, leading to a point where you reach a dynamic equilibrium. You should never try to balance two pumps, it is not practical or sustainable over time.

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