1. Clean the jar: Clean the jar with 70% medical alcohol or potassium permanganate solution, and rinse it with clean water after a few seconds.

2. Add raw materials: Put fermentation raw materials (such as soybeans, corn) into the tank, be careful not to fill it too full, and leave a certain space.

3. Add the starter: Add the starter to the tank according to the amount of starter used. Generally speaking, the amount of starter used should be 1-2 of the weight of the raw materials.

4. Seal the jar: Seal the lid tightly to ensure that the jar does not leak.

5. Place: Place the jar at a suitable temperature (usually 20-30°C) and ferment for 3-5 days. The time will vary depending on the starter culture used.

6. Observation: Every once in a while, you can open the jar and check the fermentation situation to see if there is any peculiar smell or mold.

7. Choose breathable bottle caps: Improve breathability to further digest raw materials. Recommended temperature is 15 to 25 degrees, which requires insect control.

8. Extraction: According to the required fermentation products, take out the fermented jars and perform relevant subsequent processing (such as drying, pressing, etc.).

9. Cleaning: The fermentation tank should be cleaned promptly after use and stored after thorough disinfection.