1. It has identical effect with double-deck water immersion retort
2. After sterilization process finishes, hot water is transmitted to another sterilizing pot in an attempt to achieve the goal which one kettle is applied to cool down when another is used to sterilize. As a result, working efficiency is highly enhanced and sterilization time is also greatly economized.
3. Limitations: It is of effectivity for single congeneric product. it is not practical for multiple products.