the water in the swimming pool is blue for the following two reasons. First, chemical substances such as copper sulfate and alum are added to the water to make the water in the swimming pool clear. Second, blue tiles are mostly used around and at the bottom of the swimming pool, and the water reflects blue.

why is the water in the swimming pool blue?

Adding chemical components such as copper sulfate, alum and sodium hypochlorite into swimming pool can not only make the water clear, but also play the role of disinfection and sterilization, so that the water quality can reach the standard, and people are relatively safe when swimming.

Although the water in the swimming pool has been disinfected, there may be chemical residues. It is recommended to wash your body with shower gel after swimming in the swimming pool.

Blue light and purple light are less absorbed in water, and both of them are reflected and scattered into people's eyes, which looks like water is blue.