Put Hong Bei in clear water, then put it in a dry environment at normal temperature, wait for it to spit sand, and then rinse it with clear water several times.

Introduction to Hong Bei:

shell

Qiào) There is a special gland cell in the mantle of mollusks living near the water, and its secretion can form calcification to protect the soft parts of the body, so it is called shell. Hong Bei is a kind of shellfish.