What are the routine testing items for swimming pool water quality?

The routine testing items of swimming pool water quality mainly include: free residual chlorine, combined residual chlorine, cyanuric acid, turbidity, pH value, urea, ozone, total coliform bacteria and water temperature. Cyanuric acid: Cyanuric acid is the general name of sodium dichloroisocyanurate and sodium trichloroisocyanurate. It is an organic disinfectant that will continue to accumulate in pool water. Too little will be decomposed by sunlight, and too much will easily affect the disinfection effect. Therefore, when using these two disinfectants, cyanuric acid must be monitored and controlled. Turbidity: Turbidity is the clarity of the pool water, which is an indicator reflecting the physical properties of the pool water. It can directly reflect the content of suspended pollutant particles in the pool water. Turbidity is also the clarity or transparency of the pool water. If the turbidity content is too high: 1. It is difficult to see the bottom of the pool clearly, which will affect the swimming feeling of swimmers and affect the sight of lifeguards on the shore, which may cause accidents or delay emergency work; 2. Excessive particles may harm swimming 3. There are many kinds of microorganisms in the water, which may transmit diseases to people; 4. It requires a lot of disinfection doses and the sterilization efficiency is poor. PH value: PH value is an index reflecting the acidity and alkalinity of water. Too acidic and too alkaline environments are likely to cause irritation to swimmers' eyes and skin. The PH standard of swimming pool water stipulated by the state is between 6.5 and 8.5. Urea: Urea content is a certain standard in the water quality standards of swimming pools in my country. The urea in the pool water mainly comes from the sweat, secretions and excretion of the human body. Excessive urea content indicates that the pool water is more polluted. Free residual chlorine: The regulation of free residual chlorine is to ensure the continuous disinfection ability of swimming pool water, to re-grow the remaining bacteria in the water, to prevent cross-infection and to cope with the adverse effects of sudden increase in swimming load on pool water. Combined residual chlorine: Combined residual chlorine refers to the concentration of chlorine disinfectants that exist in a combined state such as chlorine ammonia in pool water. Combined residual chlorine is strongly irritating and can cause nasal mucositis and pharyngitis. Therefore, it is necessary to limit the concentration of combined residual chlorine. The ideal concentration should be half of the free residual chlorine or less. Total coliforms: If there is a high number of coliforms in the swimming pool water, it means that the pool water has been contaminated with human feces. Ozone: Ozone has strong oxidizing properties and is a very strong oxidant and disinfectant. Ozone is a poisonous gas. When there is a certain amount of ozone in the indoor air, swimmers will easily cause poisoning if they inhale it. The concentration limit of ozone in the air on the swimming pool water surface stipulated by our country is 0.2mg/m3. Water temperature: The water temperature should be 23-30°C. Different swimming pools have different water temperatures. If the water temperature is too low or too high, the human body will easily feel uncomfortable. The portable total residual chlorine detector is developed and manufactured according to the DPD national standard method. It can quickly measure residual chlorine and total chlorine. The system is stable and can detect and expand and upgrade multiple parameters.
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