Maintaining water level in the sump

The quite stockman is quite on "your" system though. Every system is different. If you look at aquarium plumbing photos every tanks plumbing design is different. Bends , elbows straights ect. When air is in the lines maybe I should say It "may" create noise.
With the siphon systems there is no air in the lines so there is no noise. I am not saying it's impossible to have a quite system with the standard overflows but some sort of noise is the norm.
Here's a good read on silent overflows:
http://www.glassreef.com/basics_overflow.php

 

Agree with every system is different. When I bought my system from someone they had made the durso and 1 was slightly higher than the other and real small vent hole and things were noisy.

After last tear down (was going to sell it, then decided not to) I built new durso and major difference. The smallest details made a huge difference

Do to current overflow configuration of my system and a lot of others the Bean would not feasible. I did watch couple videos and agree they are freaking quiet.

 

Poseiden- WE NEED PICS!!!

This, as any system can be worked out.

But I for one need to SEE what you're using and how.

I agree with most of all the advice you have as well.
I'm a trained professional with DIY overflows and sumps ;-)

 

It doesn't matter whose system a Stockman or Durso is on, any and all can be made totally silent. If there is noise it is either due to too large of a drop over the overflow weir or fittings, bends and restrictions in the plumbing not allowing a laminar flow.

Try it yourself if you doubt it. The airline trick is not mine and it does work very well.

 

OH, so it's a trick! Smoke and mirrors huh?


J/K!