Nipples are dandy, but one overlooked and very simple, effective method is a foodgrade plastic bag (sandwich, ziplock) placed over the mouth of the jar and held

Nipples are dandy, but one overlooked and very simple, effective method is a foodgrade plastic bag (sandwich, ziplock) placed over the mouth of the jar and held on with a rubber band. The flexibility of the rubber band allows gas to escape and if paranoid about the top layer, a leaf or more of cabbage (or something else) can help press the desirable layer beneath the brine. I've found that after 10-14 days the leaves become unappealing but do not affect anything beneath. Note: I ferment in Florida, with the AC rarely below 80f unless such occurs naturally. I have learned to increase the salt and decrease the time when the temp is above 77f.