• The silent overflow of Durso - myth or reality?

  • Laurie3842

Hello! Yesterday, I started up the system with freshwater. The aquarium is 300 liters, the sump is 100 liters, the return pump is 2700 L/h, and the drain goes into a standpipe. The drain pipe is 1 inch, the return is 3/4 inch. There are ball valves on both the drain and return for adjustment. The overflow itself is set up in a classic Durso style. The problem is the following: it either works like a siphon or pushes a lot of bubbles into the sump (many bubbles) and the water in the pipe is very noisy. I've read information on this topic both on Aquaforum and ReefCentral, but I haven't found a definitive answer. Please share your experience, those of you who have a silent Durso overflow, how is your system set up?? And another question - where can I find an air valve to adjust the air intake? Thank you in advance.

Shelby3182

Markets, pet stores. Faucet for the compressor. Also. It needs to be adjusted.

Derek7322

And what, is there really no sound of water and no bubbling in the sump?

Stephanie9175

If the water is moving, it makes noise. I can hear the splashing of the water from the current pump more when it is running at full power. There are no bubbles.

Robert

Similarly. Everything is quiet. At first, there was the same problem. The main thing is that the Durso should not work like a siphon! I only adjust the drain. I need to gradually tighten it until the air intake from the top stops. A fine adjustment valve helps. The return is fully open (pump 2880 l/h). The holes at the top of the pipe have no valves at all, although there used to be some.

Kathleen

Try to do it like in the photo, so that the drain pipe is submerged in water.

Andrew9581

If there is a tap in the Durso cap and it is slightly open, then bubbles will be in the sump and the drain will be audible. If the tap is closed, there are no bubbles or noise, but it will create a siphon. I am not aware of other ways to prevent the Durso from making sounds. A slightly improved situation is achieved with a tube that is shorter than the spout, which is placed on the tap from inside the cap. Additionally, a heat shrink is placed at the air inlet on the other side of the tap, with a diameter at the end smaller than the inlet diameter on the tap. You can hear a slight air intake, but it is quieter than the return and the foam.

Kellie

I tried different options. So far, this hasn't led to anything. Maybe it's due to the fresh water, and the situation will change after salting? I'll post a photo of the overflow system - maybe I have some serious design flaws.

Lee425

Maybe after the faucet on the drain pipe, make a reduction from 1" to 3/4" and install another faucet?

Danny

The Dursot itself can be lowered, the sump can be turned, a direct drain can be made (possibly with constrictions), and the pipes can be somehow "straightened," as these "broken" ones look not very good. Also, it's better to find another hose - more flexible, not so stiff and unreinforced.

Martha

The hose here, as I understood from the photo, is for return, so it doesn't matter. The "goose neck" (also known as the spout) of the Durso really needs to be lowered a bit (about 1.5 cm). It's correct that the advice is to turn the sump so that the drain is straight. One hole won't be enough for air intake at the top. Make another one to ease the adjustment. And try to slowly tighten the drain valve. Keep in mind that the Durso is an inertial device. After tightening the valve, give the process some time. You will succeed. At first, I struggled too, but now everything is fine. P.S. Try it this way for now. Without turning the sump.

Leah

I forgot to mention. The water here doesn't matter (freshwater). It will be the same with saltwater. I set up my system completely on freshwater to have the option to fix everything if necessary. And as it turned out, it was not in vain.

Martha

SAMP is already deployed, the pipes have been rewrapped. It really is much better and more convenient this way. As for the bubbles and noise - I will give it a try. Thank you very much for the advice!

Heather2018

Feel free to reach out. We will always help as much as we can.