I use a 7-gallon round cooler with a bazooka tube. It works well (85-90 percent efficiency) but maxes out at around 13# of grain. If I'm doing a bigger beer than that I add DME to the boil to reach my target gravity.
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Primary/Secondary:
Kegged: #77 Newcastle Brown, #79 California Common, #80 Old Bushy Tail Special Bitter
Planned: American IPA, Dusseldorf Alt, American Amber
I use secondaries!
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