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freshwater aeration with drop generated bubble stream

PostPosted: Mon Dec 28, 2015 2:27 am
by little ruby1
recently I discovered an amazing effect at a water outlet of the denitrator at my freshwater breeding tanks.
During a routine check at night I saw thousand of tiny air bubbles bustling and floating below the outlet. The size of the bubbles were actually even much smaller than commonly known from marine tank skimmers.

With most of the tiny air bubbles dissolving before reaching the water surface, the simple setup could probably make a good replacement of traditional water aeration, even for densely populated freshwater tanks. To the extent of full oxygen saturation at all water temperatures.

The filtered water drops (without any pressure !!) through an air control and a short piece of silicone hose. In order to generate the air bubbles, the correct height and frequency must be carefully adjusted. Surely anyone interested could easily rebuild the system.
I assume some sort of resonance between drop and water waves creates the steady stream of air bubbles. Does anyone know more about that issue?

During daytime and with naked eyes the effect is almost invisible. But at dark, in the spotlight of a torch, a spectacular bright firework like fountain appears.

A short video clip illustrating the effect I have uploaded to YouTube.


Watching the clip, remember: It's only one single drop outlet generating the stream of air bubbles.
And it's really ordinary freshwater! It's a great energy saver too.

Three images of the self made denitrator (the three columns), the drop outlet attached to one breeding tank for tetras and a clip snapshot I've also uploaded here to all those interested.

Best regards


Re: freshwater aeration with drop generated bubble stream

PostPosted: Sat Jan 02, 2016 8:52 am
by ScottFish
Interesting post; great image. Thanks for posting! Welcome to the Forum BTW, and Happy NY!

Re: freshwater aeration with drop generated bubble stream

PostPosted: Fri Feb 19, 2016 2:54 am
by little ruby1
Hi there,

I'd really like to know whether anyone else did reproduce and observe this effect, or even better, was able to improve the
setup I had described here. All my tanks are now fitted with those droppers and the inhabitants seem to be quite happy with it.