Pavel, you and your starter will both be happier, I believe, if you feed it with all-purpose flour. Feeding with strictly whole wheat tends to introduce a lot of variables (bacteria, various organic flora and fauna) into the mix, and increases the possibility that the starter will "go off." That said, you absolutely don't need to feed starter with whole wheat in order to make whole wheat sourdough bread. Simply use whole wheat as the flour in your dough, and your non-whole wheat starter will happily support it. Good luck - PJH

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