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Well, I was going to try the old yeast bottle trick, when i noticed that my filter outtake would make a perfect co2 generator if used correctly, I think you could also use this method with any kind of filter that pumps out water quickly and makes giant bubbles of C02. These are the pics http://s460.photobucket.com/albums/qq327/harshal19921992/
What I did was basically take the top of a 2L bottle off. What I mean there is to cut off the top (All of the rounded) part of the 2L bottle. Then, wash the bottle of course and get a thick sponge that would diffuse the C02 in. I used a hard sponge which my dad brought for me. It had fine holes and was perfect. Now stick the sponge through the hole(Where the cap used to be and half of it sticking backwards towards the outtake of the filter) and get something that would hold the bottle in place (I used a purple feeder ring as you can see in the pictures). Now put the wider part of the bottle facing the filter outtake like in the picture and if you have a strong filter outtake, it'll keep the bottle facing towards it.
RESULTS:
With my own DIY Filter outtake bottletop, the bubbles that were produced when the water came out of the filter outtake were pushed into the sponge and swirled around the bottle top, breaking it up. 40% of the bubbles were broken up into tiny fine bubbles which diffused efficiently. The bubbles were knocked down into the tank, and surfaced soon after INTO the bottle top, which made it swirl around AGAIN making it into those tiny efficient bubbles you see in those C02 diffusers which you buy. Many bubbles get sucked into the sponge and get stuck, thus diffusing, and the others, since they were broken up, just wander around the tank until they diffuse. If I'm not mistaken, this method has over a 90% diffusion rate.
Any questions are no problem at all. Hope you got some ideas!

btw: I have a 30 gallon eclipse tank (Tall) specs are as follow: 24x12x24
What I did was basically take the top of a 2L bottle off. What I mean there is to cut off the top (All of the rounded) part of the 2L bottle. Then, wash the bottle of course and get a thick sponge that would diffuse the C02 in. I used a hard sponge which my dad brought for me. It had fine holes and was perfect. Now stick the sponge through the hole(Where the cap used to be and half of it sticking backwards towards the outtake of the filter) and get something that would hold the bottle in place (I used a purple feeder ring as you can see in the pictures). Now put the wider part of the bottle facing the filter outtake like in the picture and if you have a strong filter outtake, it'll keep the bottle facing towards it.
RESULTS:
With my own DIY Filter outtake bottletop, the bubbles that were produced when the water came out of the filter outtake were pushed into the sponge and swirled around the bottle top, breaking it up. 40% of the bubbles were broken up into tiny fine bubbles which diffused efficiently. The bubbles were knocked down into the tank, and surfaced soon after INTO the bottle top, which made it swirl around AGAIN making it into those tiny efficient bubbles you see in those C02 diffusers which you buy. Many bubbles get sucked into the sponge and get stuck, thus diffusing, and the others, since they were broken up, just wander around the tank until they diffuse. If I'm not mistaken, this method has over a 90% diffusion rate.
Any questions are no problem at all. Hope you got some ideas!
btw: I have a 30 gallon eclipse tank (Tall) specs are as follow: 24x12x24