Inspired in part by this thread, I have begun my sourdough journey. Three bakes so far have gone well and I plan to keep on working at it. I've been sticking to King Arthur's Naturally Leavened recipe.
My question is around starter and specifically why am I discarding so much? At some point I will graduate to recipes that call for discard but for now it's getting tossed. KA recommends 113 grams each starter/water/flour, but does it need to be 113? As long as the ratio stays the same couldn't it be say 80?
A lot of nuance and too many people claiming there are hard and fast rules around this.
Once a starter is over 4-6 weeks old and is nice, active, and strong you can treat it incredibly poorly and it'll come right back with a few feedings.
You can keep it warm (up to about 100 degrees), cool, or cold. You can feed it in all kinds of ratios and intervals and flours. You can starve it for substantial periods of time. Its crazy.
You can maintain any size of starter you want. I bake 2 loaves on most weekends and I'll describe my standard feeding routine.
A couple of points up front:
I think starters are healthier with some amount of whole grain in it. I like 30% but anything in the 20-50% is a good choice. I prefer dark rye as my whole grain but any will work.
The flour I use is thirsty and needs more water than most grocery store flours. Assume a 1:1 ratio instead of the measurement I list.
I used to work in a lab studying yeast genetics so I've incorporated some of the yeast culture ideas we used there.
I keep mine in a wide mouth pint jar with a canning lid. And it will increase size to about 2.5 times original volume.
I mix dough on Saturdays. After dumping starter into my dough mix, I have about 15 g starter left.
I feed that 45 g flour and 50 g water. It is left at room temperature until risen about about 50% (about 4-5 hours)
At this point I put it in the fridge.
Over the next 16-24 hours it will reach double size in the fridge then fall back down over the next 16-24 hours.
It stays in the fridge unfed until Friday.
Friday night before bed I take it out of the fridge.
Discard until only about 15 g starter left.
Feed 75 g flour and 85 g water.
Leave at room temperature overnight (typically 10 hours until it's ready to add to dough)
Mix 160 g into a dough (2 batards)
That leaves 15 g of starter to repeat the cycle.
At most I would be tossing 100 g of discard weekly, but I use it for other things like savory pancakes.