The advice to not keep it in an airtight container is more about the pressure that can build up from the accumulating C02 in your jar, Lynne. Just like kombucha and other fermented cultures you would need to remember to open the jar once a day if you lock it down tight with a sealed lid. One trick we often suggest if you are not going to be using it quite as often as Barb does, is to lock the lid but remove the plastic gasket. The small amount of wiggle room created is usually enough to relieve the pressure. 

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