DiY atomic Diffuser. That's right. - The Planted Tank Forum
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post #1 of 16 (permalink) Old 05-08-2011, 10:31 PM Thread Starter
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DiY atomic Diffuser. That's right.

So...after some thought and accident I've discovered what I believe to be the secret to GLA's atomic diffuser: back pressure. There's nothing special about their diffuser...just more porcelain. You see the increased back pressure compresses the co2 gas more and so it stays in the pores longer and comes out as a smokey mist instead of gobbing bubbles like you'd get from a cheaper diffuser....or so you think.


Here's my secret to a perfect co2 mist with a cheap aquatic magic diffuser to be had for 8 bucks.

http://www.youtube.com/watch?v=ZPAzcqpgsMs

Link here...this is just a quick overview...so far it seems pretty effective. Enjoy.
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post #2 of 16 (permalink) Old 05-08-2011, 11:25 PM
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nice awesome diy.


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post #3 of 16 (permalink) Old 05-09-2011, 12:11 AM Thread Starter
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No sense in throwing away those old diffusers for gla's stuff anymore, except for aesthetics really but even then you could probably jury rig something that would work like this in an external reactor type set up...
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post #4 of 16 (permalink) Old 05-09-2011, 12:23 AM
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You diserve a cookie for not saying "Jerry rigged".
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post #5 of 16 (permalink) Old 05-09-2011, 12:59 AM Thread Starter
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Quick test of co2 yields 30-60ppm co2 at about 1-2 bps in a 20 gallon tank. Not bad...not bad at all.
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post #6 of 16 (permalink) Old 05-09-2011, 02:50 AM
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what did you do to it? just slant it?


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post #7 of 16 (permalink) Old 05-09-2011, 03:25 AM
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Quote:
Originally Posted by orchidman View Post
what did you do to it? just slant it?
What a relief! I figured I was the only one who wondered about that.

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post #8 of 16 (permalink) Old 05-09-2011, 03:30 AM
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I'm feeling slow, but I can't figure out what you did either.
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post #9 of 16 (permalink) Old 05-09-2011, 03:34 AM Thread Starter
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It's back pressure. Water flowing against the ceramic disc increases the pressure just enough to make it form a fine mist instead of big bubbles. I figured this out when I was turkey basting my tank to get rid of debris on the leaves and blew some water at the diffuser to clean it off. Instead of the big bubbles coming out tiny mist bubbles came out....So I figured why don't I stick this in front of the outlet of my filter. And there you have it.
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post #10 of 16 (permalink) Old 05-09-2011, 03:57 AM
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Interesting. Maybe I'll try this. Although I have a soy baffle on y filter. So the water goes side ways instead of forwards. But maybe that will be helpful.


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post #11 of 16 (permalink) Old 05-09-2011, 04:30 AM
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Still a bit confused as to what you did. Could you run it by this slow guy right here again? Haha

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post #12 of 16 (permalink) Old 05-09-2011, 04:54 AM
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Same here. I cant fully understand what is going on in the video. It seems that there is some kind of a power head sucking the Co2 bubbles from the ceramic and chopping them away.

That is my understanding.
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post #13 of 16 (permalink) Old 05-09-2011, 05:48 AM
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He has a power head blowing directly on the diffuser. This is building pressure against the ceramic disk, which is in turn making the bubbles break more?


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post #14 of 16 (permalink) Old 05-09-2011, 03:08 PM
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I don't believe it is the pressure from the water flow that is giving that effect. First, the pressure involved is extremely small, so its effect will be extremely small. Instead, I believe the water flow against the ceramic disc is simply removing the bubbles as they form, before they can build up into larger bubbles. Similar to when you use soap solution to blow soap bubbles - if you blow carefully so the soap bubble stays attached to the wand longer, the bubble will grow bigger. This is the opposite effect - it removes the bubbles from the wand -ceramic disc- before they can grow bigger. I suggest we now call this the "JeffWW Effect".

This is not to belittle the idea at all. In fact it is very good information. We normally put the diffuser where the stream of bubbles coming out can be blown around the tank. This idea is to put the diffuser where the water actually blows on the disc, preventing big bubbles from ever forming, and giving a "mist" of fine bubbles instead. Simple and very effective, and very embarrassing to those of us who didn't think of such a simple concept. It's like when Newton got hit on the head by an apple?

EDIT:
Thinking about this some more, people use a piece of chopstick in the end of the CO2 tube to diffuse CO2. If that end was then stuck into the filter outlet fitting, as shown below, would we get much finer bubbles, due to the JeffWW Effect?


One more thought: this is why a Mazzei venturi works so well as a CO2 diffuser. The CO2 enters at the throat of the venturi, where the water is moving very fast, so it shears off the tiny bubbles before they can even become visible bubbles.

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post #15 of 16 (permalink) Old 05-09-2011, 04:59 PM
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I tried this with my diffuser and it didn't really work. I'm not sure if maybe this is because the flow from my filer isn't strong enough ( even without the baffle ) or if it's because my DIY co2 isn't giving off enough pressure.


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