It's much more like a big jar of something fermented like a sourdough starter. If you use up the entire jar and have to throw it out, you've failed to do your j

It's much more like a big jar of something fermented like a sourdough starter. If you use up the entire jar and have to throw it out, you've failed to do your job as a sourdough baker. Everybody knows that you're supposed to continuously add more raw materials to the starter without exhausting its supply.