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What is your mill gap set at? Unfortunately there is a fine line between good efficiency and a stuck mash with some of our systems.With my system over 1mm gap I don't get a stuck mash but I do get poorer efficiency, 60-65%. Under 1mm gap I manage 70-75% but end up with a stuck mash. YMMVPut a ball valve on your MLT inlet just before your sparge arm, ( or just past the outlet on your pump if that's easier) and when you first start to recirculate just have it cracked open a touch for 5 mins until you set your grain bed. Then slowly open it up a bit more and so on and see how you go. It may not work though (it didn't for me). So I just use rice hulls every brew and don't seem to have problems anymore.Also try to have your brown pump mounted so the body is vertical and pointing down so the body of the pump is upper most. These pumps are notorious for getting wort in behind the impeller and seizing the pump. (Lots of threads on here about it)It can be fixed but it's a PITA during brew day. It seems to happen more at sparge temps. Happened to me a few times and after I cleaned out the pump and remounted it, I never had the problem again.
What is your mill gap set at? Unfortunately there is a fine line between good efficiency and a stuck mash with some of our systems.
With my system over 1mm gap I don't get a stuck mash but I do get poorer efficiency, 60-65%. Under 1mm gap I manage 70-75% but end up with a stuck mash. YMMV
Put a ball valve on your MLT inlet just before your sparge arm, ( or just past the outlet on your pump if that's easier) and when you first start to recirculate just have it cracked open a touch for 5 mins until you set your grain bed. Then slowly open it up a bit more and so on and see how you go. It may not work though (it didn't for me). So I just use rice hulls every brew and don't seem to have problems anymore.
Also try to have your brown pump mounted so the body is vertical and pointing down so the body of the pump is upper most. These pumps are notorious for getting wort in behind the impeller and seizing the pump. (Lots of threads on here about it)
It can be fixed but it's a PITA during brew day. It seems to happen more at sparge temps. Happened to me a few times and after I cleaned out the pump and remounted it, I never had the problem again.
