K A S H R U T . C O M_©

July 31, 2025: from the CRC (Central Rabbinical Council
"Important notice for those using bought sourdough starter. Since your sourdough starter has already been subject to the mitzvah of challah, you are required to separate challah from every dough made with that starter- even if the dough is smaller than the minimum shiur. If the dough is smaller than the required shiur, challah should be separated without a bracha.
"A word of caution: Many people use bamboo bowls for preparing sourdough bread. Please note that bamboo can often be infested. Therefore, the sourdough bowl should be inspected by a qualified expert before each use."