Overflow Question

[jleichtman]

I'm looking at having a 40 Gallon Tank setup and I'm wondering how do I calculate for an overflow.

I know I want 10x coming back in so I would assume it would be the same to keep the levels, but how much will a 3/4" drain take to the sump as far as GPH?

Thanks

ANoobus

 

[RobNJ]

I have a 40g , my overflow is 1 1/4 inch w/ rio 2100 return pump, its pushing about 600gph

I have a proclear hang on overflow

 

[futrtrubl]

use http://reefcentral.com/calc/drain.php to calculate the size of the overflow box and the diameter of your pipe for your chosen flow rate. If the diameter is less than what you want to use then you are good.

Edward

 

[jleichtman]

I <3 U! Thanks!

 

[sttroyiii]

Dont go with the 3/4". I have a 1" on my 37g. with a mag7 return and the drain cant keep up. I have it throttled back about halfway. I would suggest 1.25 to 1.5".

 

[jleichtman]

I was thinking dual 1" lines.. i know its not equal to a 2" line but figured it would be 1.5 or so.. I want to return one to the sump and one to the refugium.

 

[sjm817]

You don't want 10X from the return. More like 3 - 5x. I'd use a 1" drain.

 

[jleichtman]

I was thinking about this but figured somebody would correct me.

If im turning the water in the main tank 10x wouldn't I need something that can handle a 10x return?

 

[sjm817]

You want 10X+ turnover in the display, not between the display and sump. Keep that low. Use powerheads or closed loops for display turnover,