After conversing with
@tracer bullet in another thread related to conversion efficiency on these AIO systems, I thought it would be good to post this here.
Well, I think Ive reached my limit for what I can do with the 10.5g foundry lol. Today I did my 3rd imperial stout on this system. For those of you who haven't seen, I ditched the malt pipe long ago for all my beers but it is necessary for these big beers. I use a brewzilla false bottom with a bag from wilserbrewer that was fitted to the kettle itself, not the malt-pipe. For beers that I need to sparge, like these imperial stouts, I drain the wort to a second vessel and "manually fly sparge" one quart at a time so that there is some liquid on top of the grain bed throughout the sparge. Not perfect, but it works. Nevertheless, I think I've reached the point of diminishing returns by pushing this system to its max.
1st Stout: 21.75 pounds (20.75lbs grain and 1lb rice hulls), and got 97% conversion efficiency and 80% mash lauter efficiency after mashing for 90minutes with a 2.5gal sparge. OG was 1.092.
2nd Stout: 25 pounds (24 lbs grain + 1lb rice hulls), and got 94% conversion efficiency and ~73% mash lauter efficiency. Same mashing and sparging as above. OG was 1.100.
3rd Stout (today): 25.75pounts (24.75lbs grain + 1lb rice hulls), and got 94% conversion efficiency and 71.7% mash lauter efficiency. Same mashing and sparge as above. OG was 1.102.
Hindsight is 20/20 lol: Today, I should have stirred the mash once more about 1hr into the mash to maximize conversion efficiency but didn't. Also, today I used a new pump which has more suction than the anvil pump. Combined that with this big grain bill, I didn't get a good lauter as I noticed the pump run dry but with sparge water still on top of the grain bed. Essentially I created a lil vaccuum and the sparge got stuck. Yes, I ran the pump VERY slowly but this didn't matter. SO not all the water ran through the grain bed (which is tall and narrow on this system) and I had to raise the bag a little earlier than I wanted. You can also see that my "vacuum comment" was likely right as the false bottom was starting to collapse.
So with all of these beers, I used a 2hr boil as well to help reach these gravities and I haven't used DME or any boil sugars/syrups in any of them. In the end, Im still happy with the outcome despite not hitting my numbers today like I was expecting due to the issues explained above. This system, with some modifications, can handle large grain bills and TBH anything 1.100+ is a big feat for a 10.5gallon foundry.
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