2 cups sugar mixed in 4 cups warm water, added to a 2 liter bottle, fill bottle to 4 inches below top, add 1/2 teaspoon of yeast, shake bottle, add water to fill to 2 inches below top. Shake bottle again and cap bottle.
Running a 2 bottle system with a gatorade bottle bubble counter I get ~1 BPS. I replace one bottle every week, but switch which one I refill.
The recipe says use 1/4 tsp of baking soda, but I dont use that. It seems to last for 2 weeks before slowing down(hence why I replace the bottle A every other week and bottle B the week I dont replace A)
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a 29 gallon high tech planted Chasing Red
, a 20 long low tech, and a 75 gallon salty adventure