Tropical Fish Forums

[jeLcoke]

I have recently made a co2 injector from instructions I found on the internet
it involves a 2 litre bottle of pop, yeast, sugar, water!
it doesn't seem to work
does anyone have instructions on how to make a good one, or even know of a site where I can go to get instructions on how to build one

help if you can!
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"if you look at her and your heart skips a beat, take the risk" -- jeLcoke original quote

[susankatomerit]

Do a search for DIY Co2 here and you will finds loads of info on it. All really good and works real well.
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47 tanks and still adding!
http://fishphotoforum.com/forum/index.php

[funcrew]

I have used DIY yeast CO2 on several tanks, and they all have the same limitation: the supply pressure is not high enough to push CO2 deep into the water column, say for a powerhead-type disperser. This is probably due to leakage at the yeast bottle cap/tubing seal.

So, you want a disperser close to the surface. A cheap and easy disperser is to use the bottom 2 inches of a 2L soda bottle, inverted and glued to the bottom of the glass top. Run the CO2 supply tubing under the inverted dome so that the bubbles accumulate. The CO2/water interface will diffuse a limited amount of the gas into the water.

Any surface disturbance, like aeration or power filter discharge will strip excess CO2 out of the water, so try to get a calm, smooth water surface during lighted hours for your tank.

Good luck!