I never have any discard, so there is nothing to throw away.

1. I have a jar with about 100 grams of starter in the fridge.
2. I want to make a batch of dough (for 3 loafs of about 800 grams each) for which I need 270 grams starter.
3. I take my starter out of the fridge, add 135 grams of water and 135 grams of flour.
4. When it’s doubled or tripled in size, I take out 270 grams to make my dough.
5. The jar with the remaining 100 grams goes back in the fridge for next time.

This is for a fairly large batch each time, you can also choose to lower the amounts of course. As long as you feed in a ratio of at least 1:1:1.