Good point, I ferment a 50/50mix of crumbles and grains.I believe that whether or not the 2 bucket system works for you is largely dependent on whether you are fermenting whole grains or crumbles and meal. Crumbles and finely ground grains plug up the holes and wont' drain well. It does work great with whole grains though.
I've moved to using the paint straining bags for 5 gallon buckets from the paint store for the crumbles. Works much better. Rather than a top bucket, I substitute the bag.
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