Durso System

[kiwis]

I've created several topics over the weekend regarding my new system which uses a noisy Durso System.

https://www.reef2reef.com/threads/noisy-overflow.409909/

That post is now 4 pages and counting and is going into other systems etc and I'm worried my new specific questions may be overlooked by new readers.. so i'm creating a new topic.

I've quietened the system with the use of some filer sponge but am worried if other objects end up down my drain i'l get a blockage while I'm out causing my room to flood.

Re plumbing with two drains isn't an option.

My question is...

If I place a ball valve at the bottom as suggested by @CookeRS will this improve things if I remove my filter from the drain?

if so how?

Image as per @CookeRS 's system

 

[ca1ore]

There is some really bad advice in your other thread. Unfortunately the single, durso-style drain is deeply flawed and there is only so much that you can safely do to quieten it. What is NOT safe is to constrain the drain in any way - no foam, no valve! The reason I'd think obvious. Since there is no backup drain any blockage beyond the constraints of the valve will cause the drain to fall behind the pump and you have a flood; or if the return section if your sump is small enough, the potential for a burned out pump.

The trouble with a durso is that its capacity is quite limited. At relatively low flow relative to drain diameter, the drain will be quite quiet. As you increase flow the turbulent mix of water and air becomes noisy, both at the drain mouth and where it enters then sump. If you increase the flow even further, you will start to see 'flushing' where the drain alternates between a siphon and an open channel. This 'flushing' means you are exceeding the safe water volume through the drain. You certainly can play around with the size of the air vent which may be helpful, but only to a small degree.

The safest thing to do is to remove any drain constraints and reduce pump flow to the point that any 'flushing' stops. This is the safe maximum flow rate for your drain. Depending upon the resulting noise level, you could convert the durso to a stockman pipe which in my view is a better single drain design. Using a filter sock on the end of the drain that enters the sump will also dampen noise there. Make sure that end is slightly submerged.

 

[kiwis]

Surely, this also has it's issues, things can get caught around the intake and I'm assuming the intake of this will be much lower than the intake of my Durso system

 

[ca1ore]

Since you have stated that going to dual drains isn't an option, I'm afraid you are stuck with a few sub optimal options. If you look at the stockman design, it doesn't necessarily mean lower water level.