What are the blue particles in the hotel bathtub?

The blue particles in the hotel bathtub are sterilized.

Used for odor removal and sterilization, widely used in public places.

Hotels (also known as hotels, hotels, inns, guest houses, business trips, inns, hotels in China, and hotels in Malaysia and Singapore) are basically defined as business organizations that provide safe and comfortable spaces for users to have a short rest or sleep. Generally speaking, it is a place for guests to stay and eat.