Silencing large tank overflow ?

[Dk Coral]

Hi

I have a 300gallon system with a 8000 liter pr hour(2000gal/h) return pump. In my overflow i have 2x 40mm Dursoes and a 32mm Durso standpipe.

These enter directly down into a sump under the tank where thay end 8cm above the bottom of the sump(in my fudge withs has 50cm of water level).

But right now they sure dont work !

There is a hell of spraying and bobbeling in the sump because of air going down with the water !

I have tryied adjusting the air intake on the top of the standpipes with out any positive resault !

HELP !

How do you build your overflow silent ?

 

[todrick]

the air is what helps it pull down but what ive seee is runing the pipe into the water thats what i did on my 180

 

[erics3000]

Lets see some pics to get a better understanding. Plumbing, overflow,drains, and sump

 

[burris]

Restricting your drain with a valve so the water backs up over the top of the drain and no air gets in will make it totally silent. Plus there will be no bubbles in your sump. Put a taller stand pipe on an unrestricted drain as an emergency in case the primary becomes too restricted.

Full thread is here: http://www.reefcentral.com/forums/showthread.php?threadid=344892