Advantages and disadvantages of water treatment chemicals for swimming pool
There are many kinds of water treatment agents for swimming pool. Different agents have different advantages and disadvantages. It is very important to choose the right medicine for swimming pool. I hope this article can help you.
1. Liquid chlorine
Highly toxic gas containing almost 100% chlorine. It should be stored in special cylinders. And there should be special chlorination equipment. Because these equipments are easy to corrode, leakage accidents often occur.
Advantages: low price.
Disadvantages: the storage equipment is easy to corrode and cause leakage. Therefore, in the current use of swimming pools are being phased out.
2. Bleaching powder
Advantages: low price.
Disadvantages: it is easy to lose efficacy, there are many residues, and it is easy to cause serious secondary pollution.
3. Bleaching powder
Bleaching powder concentrate is a mixture of calcium hypochlorite, calcium hydroxide and calcium chloride. Its aqueous solution is alkaline and has the function of oxidation, sterilization and bleaching. After dissolving in water, the disinfectant greatly reduces its disinfection effect in about four hours.
At present, the products produced by alkali process are common in the market. The price is slightly lower. The price of products produced by sodium process is about 12000, and the maximum content of available chlorine is about 70%. However, the chlorine content of bleaching powder disinfectant will naturally lose one percentage point every month. It has strong moisture absorption and is easily decomposed by the action of water and light and heat.
Bleaching powder concentrate has strict packaging requirements. It is required to be packed inside and outside the original plastic bags in sealed iron drums to avoid reaction with carbon dioxide in the air. For the above reasons, it is better to buy products with short delivery time and guaranteed quality.
There is also sediment in bleaching powder. So it still has the trouble of secondary pollution. Because its molecular structure is straight chain structure, the chlorine content volatilizes quickly after dissolving in water. Therefore, the Ministry of health requires that the water in the disinfection foot pool must be replaced every 4 hours. In addition, due to the volatilization of chlorine, the air in the swimming pool stimulates the respiratory system and damages the gastrointestinal mucosa. Long term exposure to this environment is likely to induce heart disease.
At present, most of them are used for epidemic prevention and disinfection after large-scale floods abroad. At present, bleaching powder concentrate is a common disinfectant for swimming pools in China. It is mainly used in micro coagulation process. Do not use bleaching powder concentrate in swimming pool with imported filtering equipment.
4. Sodium hypochlorite
The available chlorine content of sodium hypochlorite is more than 10%. It is a by-product of chlor alkali manufacturers. There are water, solid form. Its very volatile. In fact, its alkaline water plus liquid chlorine. The pH value is very high and must be neutralized with strong acid. However, it is still unable to effectively solve the threat of large amount of chlorine gas in space and corrosion of steel structure. It is better to use sodium hypochlorite on the same day of production. In particular, water, placed a day effective disinfection ingredients will be reduced by half.
5. Sodium dichloroisocyanurate
The chlorine content of sodium dichloroisocyanurate is 70%, which is a salt. The difference with bleaching powder concentrate is that its matrix is not lime, so there is no secondary pollution.
6. Trichloroisocyanuric acid
The chlorine content of trichloroisocyanuric acid is as high as 90%. It is 80-100 times higher than sodium hypochlorite and calcium hypochlorite (bleaching powder concentrate). It was originally a military product of the United States (Orin products of the United States). After the Vietnam War, it was transferred to civilian use. Trichloroisocyanuric acid is a broad-spectrum disinfectant. In the appropriate concentration and time, even the black spore and virus can be killed.
Trichloroisocyanuric acid is a disinfectant widely used in swimming pools in Europe, America and Australia. According to the theoretical and laboratory data, the chlorine content of a thousand tons of water can reach 0.9ppm as long as one kilogram of disinfectant is put into it. But in practice, thousands of swimming pool sample test data show that. Due to various reasons, it is necessary to put three kilograms of disinfectant per thousand tons of water every day to ensure that the effective residual chlorine in the swimming pool is above 0.5ppm for 24 hours.
Because of its six chain structure, there will be no chlorine gas in the air. The corrosion of indoor pool equipment is the least. In the cost accounting of using price, it is basically the same as the cost of using bleaching powder to keep the residual chlorine content of swimming pool water as stipulated in the national standard for 24 hours.
At present, all trichloroisocyanuric acid powder on the market are labeled with 90% of the trademark. But in practice, the difference is very obvious. Trichloroisocyanuric acid (TCCA) its chlorine feeding matrix is ca. it is completely dissolved in water without secondary pollution. But its pH value is low, long-term use will make the pH value of swimming pool water drop.
In order to avoid this situation, one kilogram of alkali powder should be put into one kilogram of trichloroisocyanuric acid. In order to master the dosage. Trichloroisocyanuric acid can also be made into instant and slow selective tablets.
About algae removal. Now with trichloroisocyanuric acid, residual chlorine can reach 1.0ppm-2.5ppm for 24 hours. 1.0ppm can inhibit algae growth, 2.5ppm can kill algae in swimming pool. And the mucous membrane (eye, nose, mouth) has no big stimulation.
7. Chlorine dioxide
Chlorine dioxide can eliminate mercaptan, cyanide, phenols and decolorization. It can reduce COD and BOD. At the same time, chlorine dioxide can remove iron, manganese, trihalomethane, odor, microbial fouling, disinfection, spore killing, virus killing, algae killing. It has three forms: water agent, crystal and chlorine dioxide generator.
There are almost no carcinogenic trihalomethanes in the water treated with chlorine dioxide as disinfectant, but the water agent is extremely unstable. The purchase price of crystal is about 800000 yuan per ton. To use chlorine dioxide generator, chlorite must be used to make it. The price per ton is 14000 yuan. Moreover, if the equipment is maintained by non professionals, it will be scrapped in one to two years. The most terrible thing is that if the process is slightly improper, it will cause explosion.
These are the water treatment chemicals used in swimming pools. Please make your own choice. If you have any questions, you can send email to us.