Originally Posted by NMG318
I have a Blichmann Tower of Power (10 Gal Blichmann Mash Tun) and had a major issue with stuck mashes during recirculation. I corrected the problem after consulting Blichmann and reading the instructions for the TOP by allowing a MINIMUM of 10 minutes AFTER doughing-in (I wait 15 minutes). This allows the water to absorb and the air to purge from the grains. By the way, the 15 gal Blichmann Boil Pot and false bottom allows a maximum of 1 gpm not .25 gpm. The .25 gpm you referenced is for the rate they recommend for lautering.
That's interesting. I have a homemade RIMS setup, that is no way comparable to Blichmann's, but I found that my recirc was getting stuck from the smaller particles falling through the false bottom and plugging the ball valve. To help this, I upped my water to grain ratio from 1.25 to 1.4, put roughly 60-75% of the water in the tun to start, and run a slow recirc while I'm adding grain. My LHBS mills the grain to .040 and until I have my own mill, am at his mercy. So I just adjusted to what he mills, which I find to be a little flourey (I don't think that's a word). His grind worked good in a beer cooler mash tun, as the smaller stuff settled under the drain hose, but since moving to a set up with the drain in the bottom of the tun, it tends to plug up the system.