Because, China's national standards: the residual chlorine content in the pool water should be maintained between 0.35 to 0.5mg/L. Therefore, China's swimming pools must be disinfected with chlorine disinfectant disinfectant; and also to meet the following four standards:
1, sterilization and disinfection capacity, and has the function of continuous sterilization;
2, does not cause water and environmental pollution, does not change the quality of pool water;
3, no stimulation or irritation to the human body is very small;
4, on the building structure
3, no irritation or little irritation to human body;
4, little corrosion to building structure, equipment and pipeline.
Two, the advantages and disadvantages of chlorine disinfectant comparison:
At present, our country should be the best chlorine disinfectants are the following: liquid chlorine, bleach, sodium hypochlorite, bleaching powder, trichloroisocyanuric acid (also known as: strong chlorine or TCCA); so, let's analyze, these chlorine disinfectant that is more suitable for swimming pool disinfection with?
1, liquid chlorine:
Inexpensive, but because of corrosive, so the equipment should be frequently updated, spend a lot of money, and the leakage of personal injury caused by the accident has been a common thing.
2, bleach:
Chlorine content is very low, to protect the national standard chlorine content, the dosage is very large. Fear of heat, light, moisture preservation difficulties. Miscellaneous dregs. To keep adding material to maintain the chlorine content required by the national standard, but will increase the turbidity; the advantage is that the PH value is not easy to down iron.
3, sodium hypochlorite:
The chlorine content of water is less than, equal to 10. 80 kilograms per day. Within four hours chlorine in the form of gas can be volatilized into the air, the residual chlorine is 0. If it is an indoor pavilion then the building corrosion is big. Thus increasing the number of overhauls. the PH value rises very quickly and has to be adjusted with strong acid.
4, bleaching powder:
is currently the most commonly used disinfectant. Daily dosage of not less than 15 - 25 kilograms. Fear of light, heat and humidity. Volatilization of effective chlorine during storage is reduced by about one percentage point per month. 12:00 pm put to 1.0PPM to the morning only 0.6PPM, 0.3PPM at noon after two pm residual chlorine amount of 0. At this time when the amount of tourists high time should be supplemented with material. If there is no circulation equipment pool [kindergarten pool] this time feeding water turbidity will be higher. Advantage is that because the substrate of the bleaching agent is lime, the PH value decreases more slowly.
5, trichloroisocyanuric acid [TCCA] (Hongda brand pool disinfectant):
Trichloroisocyanuric acid because of its six-ring chain structure form. After dissolved in water, it can keep the residual chlorine at about 0.5PPM [the prerequisite pH value should be about 7.0-7.2]. The dosage is 3 kilograms per day. At the same time should add the same amount of sodium hydroxide three kilograms to ensure that the pH value does not fall. This will ensure enough residual chlorine to kill bacteria in the swimming pool. Algae can be eliminated by 2.0PPM. And there is no stimulation of the human mucous membrane eye.