4 gallon crock + 2o pounds of shredded cabbage + pickling salt = A whole lot of sauerkraut!
I covered the cabbage with a cotton cloth, placed a plate that fit snugly in the crock and put a gallon jar full of water on top to keep the plate under the brine level.
Twice I have had to make a week solution o brine to
add to the crock to keep the liquid above the cabbage, 11/2 teaspoons of pickling salt to 1 cup water.
A few of the recipes I have read disagree on the time to let it ferment, 10 days to 4 weeks is what I am going with.
The fermentation period also depends on the temperature at which you keep the sauerkraut. The lower the temp the longer the process, the most important thing is to keep the temp as constant as possible and never above 72 degrees (it will spoil).
I am going to can mine once it is ferment because I could never use 20 pounds of sauerkraut fast enough (I can't even imagine trying) and it would be nice to give some away (isn't it just what everyone wanted). You could keep it in the crock and use what you need as long as you keep the brine level about the cabbage. I'll let you know how the canning goes.