Just did a Kolsch this weekend. I used a couple online calculators and both gave me 94% mash efficiency. I thought 80% was about the best that can be normally be done.
BIAB. 7 gallons total mash water and 6.5 gallons left after pulling the bag and a few good squeezes. Total mash time was about 3 hours with constant recirc sine I have a large dead space below the basket holding my bag. Mash temp was 148-150' with a digital controller maintaining constant temps during the recirc and then stepped up to 170 for mash out.
grain bill: 7.5# total
6# German Kolsch malt
1# American pilsner malt
0.5# American Vienna malt
SG 1.040
OG 1.044
BIAB. 7 gallons total mash water and 6.5 gallons left after pulling the bag and a few good squeezes. Total mash time was about 3 hours with constant recirc sine I have a large dead space below the basket holding my bag. Mash temp was 148-150' with a digital controller maintaining constant temps during the recirc and then stepped up to 170 for mash out.
grain bill: 7.5# total
6# German Kolsch malt
1# American pilsner malt
0.5# American Vienna malt
SG 1.040
OG 1.044