CO2 pump...
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here is my co2 pump is just 2-2liter soda bottles yeast and sugar method but I use a small air pump to pump the co2.
air pump > split line going to 2-2 liter bottles > 2 lines from bottles feed 1-20oz bottle (for overflow protection) and 1 feed line going into my box with a few 100 holes in it..
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