Size of Drilled Holes Questions for Sump and Closed Loop

  • We are currently upgrading MFK. thanks! -neo
G

Glostik

Jack Dempsey
MFK Member
Nov 7, 2006
47
6
38
Dallas
Im curious what size holes I should have drilled in my tank -

right now im going to have 2 closed loops for 2 Eheim 2260's - I planned on 2 - 1" holes for intakes and 2 - 1" holes for returns

I also have a side overflow with 2 - 2" holes as intakes and 4 - 2" holes as returns.

Im also thinking about having the back drilled with 2 more 1" holes to use as another closed loop if necessary.

Do these hole sizes sound right?

Im not too informed on GPH on sizes of holes.

This is for a 10ft long tank that im having built.
 
pumps havent been decided on yet - larger return holes will have less of a blast when returning the water to the tank.
 
I asked why 4 returns and 2 intakes, not about the size. The reason I ask is that you have twice as much return as intake. While this will lessen the restriction on flow back to the tank, it doesn't compensate for restriction on the intake. End result in my experience will be wet floor.
 
Overflow the top of the tank since your intake won't be able to keep up with the output of the pump. That or your pump will cavitate causing unnecessary wear and tear and possible failure.

If it's truly and closed system and the pump is both pulling and pushing water, you shouldn't have this problem, but with an overflow supplying the pump you will.
 
one pump will pull directly from each hole and then output to 2 of the holes on the other end. The only thing I might add is a ultra filter between.

What i meant by overflow is that there is an external box on the outside of the tank that is 24x6x24, the tank is 120x32x24.

There are slots drilled on the top, mid and bottom of this external box.
 
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