The rule of thumb is to discard part of the starter when you feed it because otherwise it'll just keep growing and growing and eventually fill your home and/or eat your block, which is not the result we're going for.
The rule of thumb is to discard part of the starter when you feed it because otherwise it'll just keep growing and growing and eventually fill your home and/or eat your block, which is not the result we're going for. It's helpful to have a scale to measure out the ratios of starter to flour and water here, but if you don't have one, measuring cups or even just eyeballing will do in a pinch.