Valve Valve

How big of a submersible pump is need for a fresh water sump rated at 1650 gph?

I'm setting up a 220 gallon tank and never set one up with a sump filter. Any other suggestions would be helpful.

What is your overflow box rated at? That is something to consider and the lower of the two values is the size pump you want, taking pumping distance into consideration. You can get pumps lower than the maximum, but if going over get a ball valve. Valves are great, but you are wasting money as a smaller pump would have been better and used less energy than the larger pump you are constricting with the valve.

The pumps have a gph rating per foot of return line, and if the return is a few feet that is the number you care about, not the gph at the pump head.

Here is a chart on the rio pumps for example: http://www.riopump.net/products_pumps/hyperflow_models.html

Also, get a check valve for the pump line. A check valve turns a pipe into a one way path where water can go up into the tank but not back down out of the tank through the return line. When the power goes off, not only is water dumping into the sump from the overflow, it is also siphoning back from the return line. If the return nozzle is deep below the water it can cause the sump to flood but a check valve will prevent this. Some people just put a hole in the return line just below the water level as a siphon break which also works.

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