Hi all,
Following advice I received and further forum reading, I took my first whack at a 5 gallon GF brew day. Following the method that Legume has laid out, I did the following:
1.) Crushed 11.5lb of bird seed (primarily millet, some milo/corn) in corona mill.
2.) Heated ~6 gallons of RO water (pH adjusted ~5.5) to 180F, stirred in grains and added 15ml of Termamyl. I recirculated in a BIAB setup for 75 minutes.
3.) Added some ice and 1 gallon of water, dropped temp to 140F, added 15ml of AMG-300L and ~2.5lbs of GF rolled oats. After 90 minutes, the wort was still grey, sticky, and starchy, and was at 1.035, when at 60% efficiency, it should have been 1.052. After another hour, there was no further conversion. I ended up dumping the wort, as it was still super starchy.
I really want to get this right, so I have a couple questions.
1.) Is 75 minutes at 180F enough for gelatinization? Would it be easier to just cereal-mash the grains and boil for a half hour or so? Is 15ml enough Termamyl?
2.) Are the Termamyl and AMG-300L that pH sensitive? Termamyl can work at the upper ends of usual mash range (pH 5.5), but AMG-300 needs to be 3.5 - 4. When I drop the temp to 140F to add the AMG, do I need to drop the pH for conversion, then add something basic to bring the pH back up after the mash to get it into regular beer pH range?
3.) Is 140F the right temp for AMG-300? Is 15ml enough?
Following advice I received and further forum reading, I took my first whack at a 5 gallon GF brew day. Following the method that Legume has laid out, I did the following:
1.) Crushed 11.5lb of bird seed (primarily millet, some milo/corn) in corona mill.
2.) Heated ~6 gallons of RO water (pH adjusted ~5.5) to 180F, stirred in grains and added 15ml of Termamyl. I recirculated in a BIAB setup for 75 minutes.
3.) Added some ice and 1 gallon of water, dropped temp to 140F, added 15ml of AMG-300L and ~2.5lbs of GF rolled oats. After 90 minutes, the wort was still grey, sticky, and starchy, and was at 1.035, when at 60% efficiency, it should have been 1.052. After another hour, there was no further conversion. I ended up dumping the wort, as it was still super starchy.
I really want to get this right, so I have a couple questions.
1.) Is 75 minutes at 180F enough for gelatinization? Would it be easier to just cereal-mash the grains and boil for a half hour or so? Is 15ml enough Termamyl?
2.) Are the Termamyl and AMG-300L that pH sensitive? Termamyl can work at the upper ends of usual mash range (pH 5.5), but AMG-300 needs to be 3.5 - 4. When I drop the temp to 140F to add the AMG, do I need to drop the pH for conversion, then add something basic to bring the pH back up after the mash to get it into regular beer pH range?
3.) Is 140F the right temp for AMG-300? Is 15ml enough?