how do i figure out my over flows GPH ?

[joseph rinker]

Im trying to figure out how big my cpr overflow is i know its a 202 or a 102 is there any other way to figure out which one it is one does 1200 gph the other does 1500 i need to know so i can get the right pump

 

[dean1977]

how big are the holes and how many?

 

[joseph rinker]

two 1 inch bulk heads

 

[THE ROOK]

I believe that a 1" hole is generally good for 600gph. I have one 1" drain (internal) on my 75 & run around 450gph pump after head loss. It's very quiet. I think the closer you get to the limit the louder the system can become.