Quote Originally Posted by don-n-sa

I believe the question that you want to know is how much water flow can YOUR overflows handle. For example: If you have a return pump the moves 1200gph, then your overflows need to be able to handle 600gph each. Now there are other factors that you need to consider...like head pressure, which is flow loss due to moving water up and through elbows.

Who made your tank/overflows?...if you can find out what your overflows are rated at in GPH that would be heplful in determining what return pump you should get.

Donny
Donny,

The question that Carlos is asking is how much flow can his overflows handle.
There is 1- 1" or 1.25" bulkhead in each corner inside the overflows.

Carlos- can you confirm this bulkhead diameter?

I believe that these may have been installed after the fact due to 3 bulkheads in bottom of tank outside of the overflows. I didn't pay super close attention to the overflows so I cannot say whether they were actually factory installed.

Chris