White whole wheat flour may be used to start a sourdough. If you continue feeding the sourdough exclusively with whole grain flour, please don't neglect a feeding. A starter fed with whole grain flour will ferment more readily (and spoil more easily) than one fed with all-purpose flour. We don't recommend feeding your sourdough starter with bleached flour. Filtered tap water should be fine for your starter. A starter that is left alone for a time may develop a liquid layer at the top; that is normal.~Jaydl@KAF

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