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DIY co2

>>Can someone tell me PRACTICALLY how to make a DIY co2 system. Right now I
add 2 cups of sugar and a 1/4 cup of yeast to a 2 liter bottle which is
hooked up to the intake of my Eheim filter anf the bubbles last about 4-5
days!! Whats wrong?? Also, How many 2 liter bottles do I need for a
heavily planted 150 gln discus show tank??

1/4 cup of yeast!! Geeez!  My special homebrew which lasts me about 3 weeks
is as follows:

3 liter bottle (Ritz Cola, you know, the cheap stuff)
3 cups of sugar
1 teaspoon (!!!!) of yeast
1 tablespoon baking soda.

I fill it up with about 2 liters of warm water (2/3 full).  My private
theory is that the additional air space above the culture provided by the 3
liter bottle helps extend its life (unproven).  The baking soda helps keep
the pH down and helps extend production ALOT!

Hope that helps...