Eliminating Starter Waste
I like to control the waste of starter (1:2:2 feeding ratio) by using this method. I change containers often, so ten grams was added to the total to offset the lost weight that remains in the old container and any hooch that may be removed.
Divide the weight of starter needed for a recipe by the number four and add two to that number. This is the target weight of starter to begin that recipe.
When the starter is ready, measure the target weight, feed it a 1:2:2 ratio, and allow it to rise. Pour any hooch from the container that may have formed, remove the amount of starter needed to begin the recipe, and the leftover will be just large enough to begin a new batch.