xico
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So
1. Are you adding grain to make up for not sparging (compared to a traditional 10g batch)?
2. How much trub do you dump before pitching your yeast?
3. How much trub are you dumping before racking to kegs?
4. Does anybody chill the beer to 40F (the lowest setting on Nathans chiller) for a few days to clear beer before racking?
Cheers!
All great input, I'm curious to see what other more experienced folk will come back with. I brewed my 61st batch with the BIAC since my sweetheart and I got the system last October. Though I am still learning the process, I think I have enough behind my opinions to share them.
1. I stopped no sparging and do a small one compared to conventional 3 vessel rigs. ~3-5 gallons depending on style and batch volume. My efficiency jumped from low 60s to consistently 72-73% I then invested in a pH meter and water sample test to dial in my salt and acid additions to the mash and sparge water and now I'm hitting 78-81% efficiency consistently.
2. I use my cylinder as a guage when to dump my trub before pitching. I take a gravity reading from the line I set up (I cool while recirculating the dump and racking valves) when I'm at pitching temp. The hydrometer cylinder will show you the profile of your trub in solution. When the stuff settled out looks clear enough to me, I dump.
There are a number of additional items I have added to the process. I bought a sight glass that I use to know when to stop dumping. It usually comes out to being about .5 gallons. I use hop bags in a steel basket and I skim the hot break off and have noticed a reduction in matter that needs removal.
As far as the other questions, I have taken to making ~17 gallon batches, I cool the temp as low as possible with tap water for 24 hours (I dont' have a chiller so I use a 14 gallon fermenter in my chamber as a bright). Recently, I just pull from the racking port without dumping and aside from the pint worth of undesirables that exists first, I lose less than the bottom port.