What are we talking here, GF, BM, HERMS, RIMS?
Ah right, well assuming it's like the GF I don't think there's any need to wait before starting the recirc. When I used to brew with a HERMS I noticed the mash would get quite compacted and the flow would slow way down if I didn't let it settle for a few minutes before turning on the pump, but with the GF grain basket setup that's not really an issue.
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