View Full Version : Ratio of sugar to yeast for CO2 generator

10-06-2010, 02:25 AM
hey everybody,

just wondering what portions you guys use... i have been using two cups of sugar in two teaspoons of yeast in a 2 liter bottle... it only lasts for a couple days... it's supposed to last about a month so i figured i'd ask and see what everybody else is using and see whats goin on with my mix haha

Lady Hobbs
10-06-2010, 02:44 AM
Cut back on the yeast to 1/2 t. to get it to last longer.

10-06-2010, 03:06 AM
ok i'll try and cut it back... i guess i goofed when i upped it from one table spoon to two lol... i'll give it a shot next mix i make, thanks for the advice

10-06-2010, 03:43 AM
Yep more yeast will make it go quicker. Though if it is only lasting a few days I gotta wonder if you might have a leak in the system somewhere. What's the rate you are getting the bubbles at?

Lady Hobbs
10-06-2010, 12:48 PM
And not tablespoons but teaspoons.

2 cups sugar to 1/2 t. of yeast or even 2 cups sugar to 1 t. yeast if you want more CO2. You don't want too much CO2 or will kill your fish.

10-08-2010, 03:14 AM
ok gotcha, yea i was worried because i'd have tons of co2 pouring out for like a week or so and then it'd just die. i'll try that this weekend when i make another batch

Lady Hobbs
10-08-2010, 09:02 AM
Best to add an airstone at night so the CO2 doesn't just continue to climb and kill your fish. Especially important in those smaller tanks.