diy co2

Discussion in 'Planted Aquarium Tech' started by ssthor, Jul 1, 2009.

  1. ssthor

    ssthor Member

    anyone know how to make a simple and effective co2 for those on a low budget????
  2. tjudy

    tjudy Executive Board Staff Member

    I use 2-liter soda bottles with a fuel bulkhead fitting designed for remote-control cars/planes in the top. I have several of those tops that will fit any 2-liter bottle, so it you need one come get it. The mixture I use is 2 cups of sugar, 1/4 tsp baking soda and 1/2 tsp bread yeast in 1 L of water. I mix the sugar and baking soda first, then at the yeast. I set the bottle aside for a few hours to let the yeast start to grow and put in on the tank after about 6 hours. You can use any of the commercial diffusers. I have a cool, but expensive, one that makes a small venturi and pushes CO2 infused water out like a small powerhead. All also have some cintered glass diffusers I had made for this purpose several years ago. I have also used another of those bottle tops with a bulkhead through it held in the bottom of the tank with rigid airline so that the bubbles get trapped under the bottle top. The gas is trapped there a long time and can diffuse into the water. Eventually a small bubble escapes from under the cap. I am not sure how effective this last method is, but it seemed to work.
  3. Marine590622

    Marine590622 Advisory Board Staff Member

    What size aquarium are we talking about?

    I found that a single two litter bottle was suffient for a 15 gallon tank for about 3 weeks, but for larger tanks I turned to using three three litter bottles and switched out one bottle each weekend.
  4. ssthor

    ssthor Member

    let me see...a 75 and a 33 long.....hey ted i might take you up on that offer.....maybe on the weekend. thanks Thor
  5. Marine590622

    Marine590622 Advisory Board Staff Member

    For the 75 gallon I would recommend you go with the three three litter bottles at a minimum. For the 75 gallon you could do 2 3 litter or 3 2 litter bottles.

    There are several ways to do this. I set up a forth bottle as a filter to trap any yeast foam and only allow the co2 through to the tank. The bulk head fittings are one way to achieve a good seal, you can also use rubberbands and silicone to achieve an air tight seal.

    You can PM me for my number if you want to talk about this off the forum.
  6. Anupam

    Anupam Member

    I have heard (and my brief experience seemed to corroborate it) that wine yeast is more tolerant of high alcohol concentrations and lasts longer. I picked some up from the Wine and Hop Shop on Regent St and have a few packets left over after I switched to pressurized.

    If you have some sort of filter that has a sponge with a downward flow of water, a simple airstone stuck into the sponge can result in almost 100% diffusion. I am using this method with my Subcurrent in-tank overflow filter and no CO2 bubbles escape.
  7. JustinW

    JustinW Member

    Can you put a picture up by any chance?
  8. JustinW

    JustinW Member

    I knew there was something I forgot to ask you about when I was up there. When I bring those tanks up if you remember remind me about this. Lot goin on right now and my mind is everywhere so I will prolly forget again.
  9. eltrut420

    eltrut420 Member

    I followed teds recipe and its been four hours and it doesnt seem to be reacting. i put 2 cups sugarin with 1/4 tsp baking soda filled the liter about 1/2 way shook it up than added a 1/2 tsp active dry wine yeast a little more water and shook it up. i have a tube running into a seperate jar and im not seeing any bubbles at all. did i do something wrong?
  10. Chuck

    Chuck Well-Known Member

    Did you warm up the water to about 100 degrees to activate the yeast? If it's too hot, you kill the yeast , too cool and it won't activate.
  11. eltrut420

    eltrut420 Member

    no i didn t read that anywhere on the web. damn i have 2 bottles goin one seems to be working and the other not. i think i used warm water in one and not the other. thanks

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