QUOTE(jctasoga @ Feb 25 2013, 08:46 AM)
instant yeast is ok. the mixture might need to modify until it fits ur purpose.
i used to make is 1/4 tablespoon yeast + 2 cups of sugar. it will take abt 2hrs to get the co2 to start up and start bubbling. then it will last about 1 week. i got 2 bottles which i kept swapping. this gone on for about 6mths until i get a compressed co2 tank. 3 mths only top up... hehe..
more yeast = faster fermentation = more co2. more sugar = longer the bacteria can keep fermenting. it depends also on your sugar water tank volume.
please get a good co2 tube and then seal the cap and tubing properly with sealant. that is the weakest part of the DIY co2. i used 1.5ltr coke/pepsi bottles n seal the top with cement glue + arcylic sealant. no problems of leaking etc.
there's only 2 types of dry yeast, since i bake, i know that there's only instant & live/active dry...
instant yeast, no need to activate
live yeast, need to activate = mix with warm water (37 to 43 degrees Celsius) + pinch of sugar. wasit for 1-10 minnutes, it'll activate.
maybe you can read this..
http://www.wikihow.com/Activate-Dried-Yeastthere are many different terms given to types of yeast..
this one is more detail & a bit different
http://www.joyofbaking.com/Yeast.html