1. Dry ice must be stored in a special freezer, so that it can be kept for 5-11 days. After the storage period, dry ice will start to form ice balls or even vaporize, and the use effect will be obviously reduced. Be sure to take the remaining dry ice out of the machine and put it in the freezer after each use.

2. Do not store dry ice in a small container with good sealing performance. Dry ice is easy to volatilize, producing gas that is 1111 times larger than the solid area, which exerts great pressure on sealed containers.