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I am probably making this more complicated than it should be but how do you generally calculate how large your sump should be? I know it needs to be large enough to contain the water in it plus the water in the tank that will flow into the sump when the return pump is turned off. My display is 49.5x31x23 with two 1.5" drains and two 1" returns. The very bottom of the return hole is just under 5" from the top of the tank. Assuming the tank was filled to the brim (it won't be) the water volume that would travel down the returns would be 33.21 gallons (49.5x31x5) plus the water in the return and drain pipes. My sump will be in the basement and my display on the first floor so there will be at least a few gallons in the plumbing.
How do I know what size sump to get without knowing the volume of water that would already be running through the sump?
Tank dimensions:
How do I know what size sump to get without knowing the volume of water that would already be running through the sump?
Tank dimensions: