The outbreak of the new crown virus at home and abroad has brought unprecedented challenges to people's lives. At the same time, an in-depth scientific popularization of the virus and its spread has been done to the people of the whole country. The government and the people will pay more attention to public health issues. And with the reform of the national high school entrance examination, swimming officially enters the 2020 national high school examination assessment project, and the water quality management and safety management of the swimming pool have become the core issues of common concern for the country and the public.

At present, domestic swimming pools and spas are facing the problem of chlorine disinfection derivatives. Because the dose of chlorine disinfection is not well controlled, it will cause harmful chemical residual chlorine to enter the air through the water body and float on the water surface during the disinfection process. If the concentration of chemical residual chlorine is too high, it will cause damage to the respiratory tract and highly irritating to the eye mucosa and skin. If a swimmer inhales excessive amounts of chlorine and derivatives during exercise, the response after swimming varies according to the tolerance of each person, such as dry mouth, dizziness, nausea, and even cough and asthma.

Residual chlorine (including free residual chlorine and chemical residual chlorine) is the key to controlling swimming pool water quality. The new national standard requires the concentration of free residual chlorine to be 0.3-1.0mg/L, and the concentration of chemical residual chlorine ≤0.4mg/L, if not Effectively control the total number of bacteria in the pool water, especially the filter bed of the filter. When the free residual chlorine exceeds 1ppm, the combined chlorine may exceed the standard, which will cause irritation to the swimmer's eyes, oral mucosa, respiratory system, skin, etc. .