Sourdough Starter Gas-Exchange Lids (Wide Mouth Mason Jars) – 0.22 Micron Filters - 12 Pack

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 guests in. Baking success starts with the container — give your starter the right home.

Usage tips:

• Wash and sterilize your jar and lid before first use.

• Feed your starter or prepare your ferment as usual, then screw on the gas-exchange lid and finish with your band (if using).

• Place the jar in a location with stable temperature; the filters will silently handle the pressure release.

• Clean the lid after each batch to ensure long-term performance.

Specifications:

• Quantity: 12 lids included in this pack. 

• Compatibility: Fits all standard wide mouth mason jars (32 oz & 64 oz)

• Filters: Two 0.22 µm synthetic membranes per lid

• Maintenance: Hand-wash recommended (warm soapy water)

Elevate your fermentation game — give your starter the breathing room it needs and the protection it deserves.