Use half whole wheat, half bread flour for the first few days:
Day 1
25 g whole wheat + 25 g bread flour + 50 g water
Days 2–4
keep 50 g, feed 25 g whole wheat + 25 g bread flour + 50 g water
Day 5 onward
switch to all bread flour feeds so the flavor stays clean.
This method often bubbles sooner.
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