Sourdough Starter Gas-Exchange Lids (Wide Mouth Mason Jars) – 0.22 Micron Filters

Turn your wide-mouth mason jar into a premium fermentation vessel with our gas-exchange lids — designed by seasoned sourdough bakers who wanted better control over airflow and contamination. Key features: Each lid is pre-modified with two high-quality 0.22 micron synthetic filters, allowing carbon dioxide and fermentation gases to escape while blocking insects, dust and airborne debris. Compatible with standard 32 oz and 64 oz wide mouth mason jars — just use your existing jar and band, lid fits seamlessly. Simple maintenance: Hand wash with warm soapy water, dry thoroughly, reuse again and again.  Ideal for sourdough starters, fermenting vegetables, kombucha, and other home-fermentation projects where controlled airflow is important. Why choose this lid?Traditional metal lids screw down tight or sit loose — they either trap pressure or allow uncontrolled airflow (and contamination). These lids strike the right balance: your culture can “vent” safely without letting unwanted