We all know that all kinds of disinfectants and pool water treatment equipment are used in the pool water treatment process to achieve disinfection effect. The significance of these limits is that they can better maintain people's health and meet people's sensory requirements on the premise of water quality microbial safety. Most disinfectant effects depend on the pH of the pool water, and high or low pH can affect swimmers. Therefore, in swimming pool water treatment, it is very important to keep the pH in the best effective range of disinfectant. The national PH value of standard swimming pools is between 6.5 and 8.5, while the optimum PH value for the human body is between 7.2 and 7.6.
What is the state of the pool disinfectant at different pH levels and what does it do?
1. When the PH value of water is greater than 8.0
At this time, most of the pool water is hypochlorous root, and hypochlorous acid (residual chlorine) is only a small part, so it will inevitably reduce the activity of disinfectant in the water, and then affect the growth of algae and sterilization effect, resulting in the wild growth of green algae in the pool water; It can also lead to low or even undetectable residual chlorine, which is not due to the quality of disinfectant, but due to improper PH control. Swimming pool water treatment PH value is high that the water alkaline, so the treatment method principle is relatively simple, that is, the use of acid and alkali neutralization principle.
（1）, can increase acid in swimming pool water, such as hydrochloric acid properties of acid. Often in the test of swimming pool water PH value is as high as 8.2, the appropriate amount of hydrochloric acid. Example: when PH value is 8.2, 5-10 kg can be put into each 1000m cubed water to restore the best status (dosing pump automatically dosing).
（2）. You can dilute the alkalinity of water with water. Most of the time, the water in the southern pool is acidic, and so is the sweat on the swimmers' bodies.
2.When the PH of water is less than 7.0
Most of the water in the pool is hypochlorous acid, which is called residual chlorine. Hypochlorite is a very small fraction, so the disinfectant is very active in the water, and a lot of the disinfectant that goes into the water is wasted, so the residual chlorine goes down. The key is to set the PH to the optimum level for disinfectants to work: 7.5. Half of such disinfectants will hydrolyze into residual chlorine to disinfect. When the residual chlorine content drops, hypochlorite will combine with hydrogen ions in the water to form (OCI-)+(H+)→HOCI, which can keep the disinfectant effect for a long time. Therefore, we should try to keep the PH of our pool water at 7.5, which not only ensures disinfection but also maximizes cost savings. Swimming pools often use sodium hydroxide or sodium carbonate to increase the PH of their water.
1.Use sodium hydroxide: 10 grams per cubic meter of water for every 1.0 degree increase.
2. Use sodium carbonate: 15 grams per cubic meter of water for every 1.0 degree increase.