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> Date: Tue, 10 Jun 1997 15:23:02 -0700
> From: Eric Wahlquist <ewahlquist at mijcf_org>
> Reply-To: ewahlquist at mijcf_org
> To: aquatic-plants at actwin_com
> Subject: DIY CO2
> I feel like a have a stupid question but I've become stumped in my
> attempts to create a satisfactory yeast mix for my DIY CO@ setup.  My
> first mix was @ six cups water, 2 cups sugar, 1/2 tsp yeast. It bubbled
> for about a day and then nothing, even after I shook it up for the next
> few days.  I thought maybe it was too much sugar (I make bread and know
> what too much sugar and salt can do to yeast) so I made another batch
> using only 1 cup sugar.  It too bubbled for about a day and then
> nothing. I added a bit more yeast, got a big bubble into my plastic cup
> reactor, and then nothing.  I just made another batch using 1/2 cup
> sugar and am having the same problem.
> I'm using a 2 liter plastic bottle with clear 1/4 tubing coming out of
> the cap and sealed with silicon. It is trapped under a clear plastic cup
> I have lodged under my filter intake. I was hoping to see the bubbles go
> into the reactor at the rate I've read about, but have yet to see any
> activity that lasts longer than a very short day.

Before doing anything else with the mix, you should check the integrity of
the seals (bottle-to-cap, cap-to-tubing and any other there might be).
When I first set my system up, I got a short burst of activity then
nothing because of a slow leak in one seal.  I went through a couple
iterations on the makeup of the mix, then found the leak.

If there is no leak, you might try adding some baking soda.  I use a half
tablespoon in a gallon of mix.  This seems to help regulate things (right

Roger Miller.