Noisy overflows

[andrew catling]

Hi guys,

How do you combat the gurgling noise made by overflows?
I remember all too clearly the maddening noise my last tank made and never really got it as quiet as I woud have liked.
My tank is drilled at the base with a stand pipe.
Any suggestions, diagrams, or pics would be extremely grateful.

Thanks.

 

[Navarre]

A Durst Standpipe is said to reduce noise (I think its called Durst). You can place sponges under the "inflow " of the pipes to the sump and this also help cut down noise.

 

[ostrow]

Durso. What does the top of your standpipe look like? Is there a cap on the top?

I have a hole drilled at the top of my Durso cap, with one of those little plastic air flow regulators (used with air pumps to control flow out of them). I adjust as needed to keep the overflow silent.

 

[andrew catling]

It's just a straight 1.25"pipe at the moment, im looking for a way to design the outlet as to eliminate the noise.
Whats the durso pipe?

Thanks

 

[andrew catling]

Just did some browsing on the internet and now know what the durso standpipe is.
But I dont have an overflow chamber in my tank, would this still work with a direct flow from the tank.

 

[ostrow]

I don't understand then how water gets to your sump. You have a pipe that is fully open and the top is at the waterline? That is not what you want, really. I am not sure how best to modify it. You MIGHT try this. Get an elbow and then attach a largish piece of PVC running horizontally with slats cut in the side, perhaps 3-5" long depending on the size of your tank with 5 or so cuts in the side of maybe 1/8 - 1/4" width each. You want a close cap at the end of this. So then your intake is horizontal and perhaps more gently. Though you will still hear some rushing that should cut the gurgling.

I do not think a Durso Cap without an overflow chamber makes any sense or would work but I could be wrong. I'd post this question on a reef-centered board like RC.

 

[andrew catling]

Thanks for the advise,

Fortunately my tank is drilled in the corner so i'm going to build an internal overflow chamber myself and put in the durso standpipe.
I assume the top of the chamber should be about an inch below the surface with some kind of comb strip to stop fish swimming into it. is this correct?
Dont want them in the sump.

Thanks.

 

[Navarre]

Yes taht is the usual design. I have a problem wit my Hectors goby going over my weir at the moment... 4th time this week!

 

[ste2k3]

This is the ideal setup:

durso behind a weir. I'm using a new method on my tank. I'v got 3 40mm holes through the base, 2 have the stand pipe cut down 4-6" below the surface and the 3rd is about 1" above the surface. I'v fitted ball valves to the 2 cut down pipes. if you close the valve(s) so that water goes down but no air then its silent and in the sump the pipes go straight under the water surface to avoide splasing. this is silent although you will need more than one hole for this method. one to restrict the flow and a spair to take the water if the first gets blocked with a snail or a fish etc, then the watre wont end up on the floor.

ste