With the improvement of people’s living standards, there are more and more recreational activities, such as playing ball games, swimming and so on. In the summer, there are many people will go to the swimming pool swimming, but its water pollution situation is we can not ignore, it will directly affect people’s health. So what indicators do you need to test to know the quality of swimming pool water? This chapter water quality online monitoring instrument manufacturers to understand together with you!

The main test indicators of swimming pool are: water temperature, turbidity, free residual chlorine, pH value, urea, total bacteria, E. coli and so on.

· Water temperature: The water temperature of the pool is low or high, which will make the human body feel uncomfortable, and it is necessary to maintain a stable water temperature, generally between 22 ° C and 26 ° C.

· PH value: It affects the swimmer’s comfort, the clarity of the water, etc. According to relevant data, the PH value is between 6.5 and 8.5, and the human body feels more comfortable. If the PH is too high or too low, it will irritate the skin.

· Residual chlorine: The standard content of residual chlorine is an indicator of the remaining disinfectant after the pool water has been disinfected with chlorine-containing disinfection agents. The residual chlorine concentration is too low to achieve disinfection effect, and too high will stimulate the skin, respiratory tract and viscera of swimmers. In general, the case of high residual chlorine is relatively rare. (The total residual chlorine in water can be monitored in real time with the RCl900 total residual chlorine online analyzer.)

· The total number of bacteria and coliform bacteria: they are microbial indicators, can reflect the health status of water quality, if exceeded, it indicates that the pollution phenomenon is serious. People often say that the spread of pink eye is likely to be caused by unqualified microbial indicators.

· Urea: Excessive urea, easy to lead to swimmer’s skin mucosa damage. The urea in the swimming pool, on the one hand, comes from the swimmer in the water to steal urine, on the other hand, if the swimming place manager for new water is not timely, urea will remain in the swimming pool, resulting in excessive. (The WECT-900 online water E. coli analyzer can be used to monitor the E. coli content in water in real time.)

· Turbidity: the turbidity index of swimming pool water quality is not more than 5 degrees, and the clearer the water quality, the lower the turbidity. Resulting in excessive turbidity, mainly due to the automatic water circulation is not in place caused by the failure to timely add new water, leakage of disinfectants, coagulants and so on. According to the regulations of the health supervision department, the pool must self-test every day, and publicize the residual chlorine, pH value and water temperature three data.

In addition, free residual chlorine is an important indicator to ensure the water quality and health of the swimming pool, according to the “health standards for swimming places”, the residual chlorine content of the pool water after chlorination disinfection should be controlled at 0.3 mg/l -0.5 mg/L, and the total number of bacteria per milliliter must be less than or equal to 1000. Excess chlorine concentration is too high, will produce chlorine odor, and may cause irritation to the human skin, eyes and respiratory system, if a long time in the environment swimming, will also cause yellow hair, dry skin and other adverse reactions.

Warm Reminder

If you often go to swim, is to simply understand some small knowledge! To distinguish the quality of the water. It can be judged by observation, sight, smell and feeling.

· To observe means to look at colors. If the residual chlorine content of the pool is normal and the water quality is good, the pool water is bright light blue; If the water is white and slightly cloudy, it may be an excessive number of bacteria.

· View, mainly refers to seeing whether the water is clear or turbid. The pool water should be clear and transparent to the naked eye. Standing on the side of the pool, you can see the fourth and fifth lane lines across the water. If there is no sediment at the bottom of the pool, the foam dissipation time of the pool is within 15 seconds, indicating that the pool water is changed frequently and is relatively clean.

· Smell, is close to the water to smell the smell of water, if you can smell the faint taste of chlorine, is qualified. If the smell is too strong or even choking, the available chlorine concentration may exceed the standard.

· Good water quality feels soft, if it feels hard, astringent, or even itching on the body, the water quality may be poor.