Has anyone tried this technique to fill the mashtun? I did this last week as I had 24lbs of grain to mash-in with, and found bottom filling the mash ridiculously easy… I have found very few references on this or other forum regarding underletting - mostly for freeing stuck mashes. Most of the references seem to be from the UK or Australia.
i put 24lbs of grain, dry, directly into the cooler and pumped all the sparge water in through the spigot/drain-manifold. I had to adjust the water temp prior to this to take into account the transfer and pumping, but hit my 154F right on. As the water rose, there was some general uplifting of the grain, and I began stirring once I saw the water begin to break the surface. Could not have been easier, with no lifting and simultaneous stirring.