Well, here's what's been going on. The recirculation during the mash is fine. But when I then drain into the kettle for the continuous batch sparge, it's a trickle and the mash tun fills up faster than I can drain it with a wide open valve.
I stirred and kind of lifted the manifold a bit and flow corrected itself and was fine for the rest of the sparge. My speculation is that without the pump suctioning it, the compacted grain bed wouldn't gravity drain.
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On Tap: New Zealand Porter, Green Flash IIPA Clone, Simcoe IIPA, Bavarian Hefeweizen, Kiwanda Cream Ale
Kegged
Pressurized Sanke with spund valve: Breakfast Stout
On Deck: Lager?
Gone but not forgotten: Simcoe IIPA, Bee Cave Kolsch.
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