Can someone post a youtube of these quiet sumps? I gave it a try, but even the quiet designs I tried you could hear the trickle of of the water. An eheim canister filter is dead silent. That was the deal breaker for me. For me a sump is superior because it excels at oxygenating the system. I've got a used sump system in the for sale forum.
You won't find what you are looking for. Sumps have some noise no matter what. They can be extremely quiet, but if the sound of surface agitation annoys you, sumps make about that much noise. If you are use to canisters with returns under the water, no surface agitation, etc, it will be noisy. There is a sound of running water because it isn't a closed system.
ADJUST with gate valve precision.
- The Emergency standpipe is waiting for an issue with the normal operation of flow.
The Herbie drainpipe method
used for 2 holes typically in the aquarium (1 norm, 1 emergency).
The Bean Animal drainpipe method
for the aquarium exit holes and now with 3 drains out.
The pipes have a lot to do with the sound.
These two methods (above) have dead silent sound once controlled with a gate valve.
The Pump is where the sound is coming from at times.
Control the sound vibration issues by using a DC controllable pump
OverSized and turned down a little bit to control the noise of the harmonics of a pump on high.
Sometimes the sound issue is the dampening of the pump by using additional silicon rubber feet.
The trickle area of a filter is a area of interest too.
The porosity of foam used in a stack vertically does change the sound as well.
Being able to tune the sump noise from pumps and pipes the key.
There is a silent sump.
My computer fan sounding noise on my Kessil light is the only noise now.
IS A link to a GHOST OVERFLOW.
This is a very new method of doing things with the water and eliminating noise.
Even the cheesy open sump design below is not complete and is still silent.
The only noise comes from the stack of sponges in the 1st part. That can be adjusted by moving the sponge closer to the falling water. It should be simple common sense.
I still see plenty of air bubbles running toward the sump foam to aid in biological bacteria.
I have other posts over the forum on quiet sumps.