Hi marimo, my DIY CO2 is very simple, similar to recipes widely use around here.
Basically for each 1L bottle I use:
- 250g sugar
- 1/2 tsp active dry yeast
- 1 tsp baking soda
Filled bottles with sugar, baking soda & warm water. While letting these bottles to cool down, I will then activate the yeast separately with sugar, warm water & stir vigorously to inject oxygen. Once they started working & foaming heavily, poured them into the bottles & sealed.
Usually I'll get bubble within 1 hour & the pressure will start building, in 4-5 hours the glass diffuser already diffusing at 2bps rate. This can last around 3 weeks, but I'm planning to replace it every 2 weeks at night, to minimize the CO2 downtime.
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