Hi, Sandra. Yes, of course, you can share your discard with a friend. The reason you need to discard half is because as your starter sits, the yeast and bacteria generate both lactic and acetic acid. That acid, in high enough concentrations, inhibits the growth curve that you're trying to capture. The starter you're using now is called a Friendship starter, and is usually part of quick bread recipes. Thanks for the props about our recipes! Susan

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