When I make kraut I have a 5 gallon bucket that is food grade. I bought one of the screw on lids with a gasket in so the top seals, you can get them a Home Depot for about $8.00 I got an airlock off amazon for about $5.00. I drilled a hole big enough forthe tube to the airlock in the screw on lid and hot glued it to the lid. Now you have the same thing as one of the $100.00 crocks for about $20.00.
With the air lock on their you don't get any of the crud and scum and the kraut is as good as any. I make the same as other people have said. 5 lbs cabbage and 3 TBS. of any non iodized salt. The iodized salt will kill the fermentation. I keep layering until About 3/4 full crushin and mashing with a ballbat. Push down and put 3 or 4 dinner plates on it to keep the cabbage submerged. Screw the lid on fill the airlock with waterand set it in the basement whwere it will stay around 70°, in about 4 weeks you will have some good kraut.
When it's done and to where I like the taste of it I put it in vacuum seal bags, suck it down to where you just see the liquid going up the bag and seal it before any liquid is sucked out. Store it in the bottom of the fridge out in the garage. I don't ever process in canner as this will kill the good stuff in it that is supposed to be so healthy for you. Hardly a week goes by that we don't eat kraut one way or another. Way better than any store bought stuff JMO. jroc