Fermentation Jars: Glass vs. Plastic, Which Is Best?

Advantages of Glass Jars

Glass jars have several advantages over plastic containers for fermentation. One key benefit is their non-reactive nature, meaning they won’t leach chemicals into the fermented foods, such as off-flavors or unwanted nutrients. Glass jars are also easier to clean and maintain a sterile environment, reducing the risk of contamination. For a 5-gallon (19-liter) batch of sauerkraut, a glass fermentation jar with an 8-quart (7.6-liter) capacity is ideal.

Considerations for Choosing a Glass Jar

When selecting a glass fermentation jar, consider the size, shape, and material. Borosilicate glass, such as Pyrex, is a popular choice for its thermal shock resistance and durability. Look for jars with a wide mouth for easy access and a secure lid to prevent contamination. A 5-gallon (19-liter) jar with a 4-6 quart (3.8-5.7 liters) capacity is suitable for most fermentation projects.

Maintaining a Sterile Environment

To maintain a sterile environment in your glass fermentation jar, ensure the jar and lid are properly cleaned and sanitized before use. Use a mixture of 1 tablespoon (15 ml) of bleach to 1 gallon (3.8 liters) of water to sanitize the jar and lid. Allow the jar to air dry before filling with fermented foods. Regularly check the jar for signs of contamination, such as mold or an off smell, and take corrective action as needed.