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Yeast nutrients, not a good idea?
I don't think you really want to add a lot of nutrients to your DIY CO2
yeast mix (malt extract, vitamins, whatever). Plain table sugar is
going to be cheapest and best. Unlike growing yeast in culture in the
Micro lab or the beer fermenter (where you *want* explosive growth of
the colony) for CO2 production you want a steady-state population,
limping along and producing a steady, constant quantity of gas. Right?
Not an exponentially growing number of yeasty beasties producing an
exponentially growing quantity of gas (and dying in their own wastes all
that much faster.)
Champagne yeast isn't going to cost any more if you re-use the sludge
at the bottom of the bottle.
-- Sherman Lovell