Jim - I'll assume your must is 22 brix or SG 1.093. Water weighs about 8.3
lbs per gallon so your 1.093 must would weigh 9.1 lbs/gallon. Your 100 lbs
of must will be about 11.0 gallons. In my experience grape must contains
about 2/3 juice and 1/3 skins, pulp and seeds. Using this value you have
about 7 gallon juice. I've been using
2 grams Fermaid per gallon juice. In the past I also added 1 gram DAP per
gallon juice. So, I would add 14 grams Fermaid and 7 grams DAP to the 100
lbs must. Last fall I only added Fermaid and had no fermentation problems.

Bill Frazier
Olathe, Kansas USA

"Jim" wrote in message
...
I am curious to know how much Fermaid K and how much DAP one should
use per 100 pounds of grape must? I was thinking 15 grams of Fermaid
per 100lbs of must and 30grams of DAP per 100lbs. I feel with this
combination I should never have any fermentation problems.