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Discussion Starter #1
So I'm going to try and make one of those simple yeast/sugar CO2 reactors I've read about, but I'm confused as to where I can get a check valve? aquarium store or lowes maybe? what size should it be. My airline tubing looks to be one of the smaller sizes. Also if I run the line into my hob filter intake, that wouldn't work because of outgassing as soon as it gets into the tank right? How else could I run the line without buying a diffuser. Trying to do this really cheaply to start out. Thanks for any help. :)
 

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You can get check valves at any fish store and walmart (~$2.5 for one). Or you can get 10 from ebay (~$3 for 10, but 2 weeks of shipping). The size you get is pretty standard, just visit any fish store/walmart for that (4mm inner diameter if my memory serves right).

A glass diffuser really seems like the Cheapest way of diffusing CO2 already... so I don't know any other recommendation. You can start getting a cheapo from ebay (~$6-7). Even then, I think my diffuser wasn't doing a good job and I switched out to reactor...

Hope it helps a tiny little bit.
 

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Discussion Starter #3
thanks justin, went and got some silicone tubing and valve and it's all set up now. I've got the tube running to the venturi type plug in on a maxi jet powerhead so it cuts it into finer bubbles. I used 2cups sugar and 1/2 tsp yeast, 1/4 tsp baking soda in a 2L bottle about 3/5 full of water. It's been going for about 1.5 hours, but barely trickling any bubbles, sometimes none. How long does it take to get going at a good clip? Thanks
 

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When i made my first batch of yeast generator, it took almost a whole day to really get going. Now when i make it, 2 hours tops, and it's full blast. There are a few variables though. I always use hot/warm water to activate my yeast. Also, i use the same temp water to mix up the sugar/baking soda in the bottle. After all ingredients are added, i try to keep the bottle in a warm place until ready to be hooked up.
Did you activate your yeast beforehand? Did you mix up your other ingredients using warm water?
 

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If you take the tube out of the venturi, do you see actual bubbles coming out? Perhaps your Maxi Jet is chopping up the bubbles to such a fine degree that you cannot see them? However, if you take the tube out and see no bubbles, I would wait a bit longer (say 2-3 hours). If still, no bubbles are being produced, I would look over the entire setup for a leak.
 

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Yes, like thrak76 said, you should try mixing the 2 cups of sugar and the 1/4 tsp of baking soda in the soda container with warm water first. Then on a separate smaller container, dissolve/mix the 1/2 tsp of yeast in warm water. After the yeast dissolve, just add it to the soda container, mix it in and you are done.

If you want to make sure you have bubble coming out, you can get use another container (anything with a larger cap, as you need to run 2 lines in and out, I use Gatorade) as bubble counter. That could help you count the bps, and it could also "clean" the bubbles a little bit. There should be plenty of instruction over the internet and you have probably found it already. Let me know if you couldn't find one.

I used 1 tsp of yeast instead of 1/2 and I am getting a pretty good result. I have used a ceramic diffuser so the pressure needed to be pretty high to get going; and I always had bubble mist coming out after an hour or so.

Hope it helps a tiny bit. Good luck!
 

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Discussion Starter #8
thanks everyone, it's working well now, I ran it into the intake of a maxijet and the bubbles are super fine mist about every 10 seconds or so. I think I already notice huge improvements, is this possible after 24 hours? new roots forming, new growth. Should I now start dosing with Flourish since my CO2 is higher? lights are t5 48watts over 29g.
 

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I would definitely start dosing both micro and macronutrients. You have sufficient light to warrant this, since T5 bulbs are significantly more effective at lighting a tank than (say) T12 or T8 bulbs.
 
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