Originally Posted by dinnerstick
you can improve on this a lot. you must be getting 60-65% efficiency? how much grain are you using? i just posted a couple days ago (sorry to repeat) 81% efficiency to get 25L of 1.069 wort post 60 minute boil, using 6.86 kg grain total. for a 20L batch i can get into the high 1.070's easily. some things to consider trying perhaps: adjust your crush, maybe try the exact same mash with a finer or coarser crush and see how it changes your efficiency. stir the mash frequently, 3-4 times in a 60 minute mash is a minimum. for sure this helps a lot. i always do a small protein rest, i have no idea if this helps efficiency. mash with the lowest amount of water you can circulate and sparge as slowly as possible, get your volumes just right so the sparge gets you exactly to your pre-boil volume. i also like to add specialty grains that don't need mashing at the end (last 10 minutes) of the mash.
it's worth noting that the instructions in the manual are for no-sparge brewing.
Thanks for the reply. I will definitely try stirring the mash more frequently to see what happens. As for milling, I have basically been using my barley crusher at fairly close to the default; around .040. I haven't changed it much since i'v been using my BM as it was what worked best on my old 3 vessel setup. What do you mill at?
Also, the numbers I mentioned were pre-boil not post boil. I think I should try starting with less water and maybe sparging more. I just figured the point of the BM is to not have another pot on the stove so my sparge has been limited to usually around 2L from my kettle which means starting my mash around 27L if im doing a 90min boil to achieve a full 20L batch. This is also partly because of how much I leave behind in the trub.
I have an idea for a whirlpool system but I'm not sure how well it would work. Ideally I would like to have a small inline pump attached to two SS lines, one which would draw from the middle of the pot near the top of the liquid level and the other end discharging on the side to create the whirlpool and and piece of steel to support it all resting horizontally across the top of the pot.
I just don't know if I can find a proper pump that will be small and light and self priming and food safe for a reasonable price and if it will prime totally dry. My other thought was putting in a drill pump. Otherwise, I could always change out the OE spigot and put in a 3/4 SS ball valve and attach a pump to that and then plumb it up over the top and back down to whirlpool.