Cheapest DIY CO2 system I can do?
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Old 07-05-2014, 01:43 AM   #1
Lilyth88
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Cheapest DIY CO2 system I can do?


I'm a CO2 newbie. What's the cheapest I can do it? And how do I do it?
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Old 07-05-2014, 02:09 AM   #2
hobos
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How big is the tank ?
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Old 07-05-2014, 02:12 AM   #3
Diana
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Depends on the size of your tank, but I use a 2 liter soda bottle, a smaller Gatorade or similar bottle and some air tubing with a throw away bubbler.

1/4 tsp yeast
4 cups sugar
8 cups water:
This works for me, you can sure figure out another way, if you want:

4 cups will be boiled, dissolve the sugar
1/2 cup to proof the yeast
3 cups to cool off the boiled water
1 cup to rinse it all off the funnel (make sure it ends up in the bottle)

pinch KH2PO4

Warm a small amount (half a cup or whatever) of water to skin temp. Dissolve yeast in this. Let it sit while you prepare the rest.
Bring about half the water to a boil, or nearly. Turn off the heat. Stir in the sugar and keep on stirring until it dissolves.
Add KH2PO4
Add cold water. Let it sit to cool off some more.
When the sugar water is no hotter than the yeast water (colder is OK) mix both. I simply pour the yeast through a funnel and into the bottle, and then the sugar water. The last cup of water rinses the funnel. This also adjusts the volume. If the "2 liter" bottle you have is not quite, then omit this last cup.

Plumbing:

Drill small holes that air tubing will fit through, but with difficulty.
One hole in the cap of the 2 liter bottle, 2 holes in the Gatorade cap.
Cut the air tubing on an angle so it is pointed. Stick this point through the hole and pull it with needle nose pliers.
1) Tube from 2 liter to Gatorade bottle. This one is short inside the 2 liter (maybe an inch long or so) and is long into the Gatorade bottle. I add a bit of the stiff tubing that came with some under gravel filters, but this is optional.
2) Tube from Gatorade bottle into tank is short inside the Gatorade bottle, and long into the tank. A suction cup keeps it clipped to the side of the tank right under a power head (I have lots of Koralias in the tanks).

Tape the Gatorade bottle to the 2 liter bottle. Then make sure the bottles will not fall over.

The Gatorade bottle acts like a separator. If the yeast/sugar mix enters the tube, it falls out in the Gatorade bottle, not the tank.
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Old 07-05-2014, 02:16 AM   #4
burr740
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Here's mine using 3 2-Litre bottles, will work the same for 1 bottle or whatever

http://www.plantedtank.net/forums/sh...d.php?t=659290
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Old 07-05-2014, 03:31 AM   #5
Lilyth88
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Quote:
Originally Posted by hobos View Post
How big is the tank ?
30 gallons.
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