here is a post i made on my set up.
- 2 cups sugar
- 1/2 teaspoon yeast
- 3/4 full of water two-liter bottle (warm water, NOT hot)
- one 2 liter bottle
- one 16oz gatorade bottle
- check valve
- airstone for diffusion (i'm now using an eBay glass/ceramic diffuser)
- mixed up the yeast in a separate cup of water, let sit fo 15 minutes
- added two cups of sugar to the 3/4 full two-liter bottle
- after 15 minutes, added yeast to the two-liter bottle
- gently shook/swooshed the bottle to activate it
- used superglue on the outside of the bottle cap/airline connections to seal
here are some pix and more details on my set up...
2L bottle 3/4 filled with warm water, 2 cups of sugar and 1/2 teaspoon dry yeast. it has one tube going from just underneath the cap, into the bubble counter, make sure that tube goes a couple inches past the water in the bubble counter
smaller gatorade bottle, filled 3/4 full with water. this has two tubes in it, one from the reactor, and then the outgoing line that goes into the tank. the outgoing lined should be positioned about 3/4" beneath the cap, this allows the gas to exit and flow up through the check valve and then into the tank. to diffuse it, im using an airstone, i do have an eBay diffuser on the way though.
the airstone is placed at the end of the airline and rests just beneath the intake. the gas is released and is sucked into the intake, the bubbles are very small. hopefully my ebay glass diffuser comes this week.
what you cant see in this pic is the "check-valve" that is being used. it is placed on the outgoing (left side) line, it is used to prevent syphoning of water from the tank into the reactor. a bubble counter isn't exactly necessary, but its highly recommended to prevent the gunk/residue that can build up (from the yeast and sugar) flowing into your tank.
i've had great success with my DIY CO2.