Water quality management, every swimming pool site needs a testing tool to judge the quality of water by testing the indicators in the water. Water quality testing plays a decisive role in the management of swimming pool water quality and is the key to ensuring the cleanliness and sanitation of swimming pool water. If the qualified rate of swimming pool water quality is low, it means that the swimming pool water quality testing is not paid enough attention, or the swimming pool lacks a good testing tool, and the lack of a reliable testing tool will also affect the water quality, so the swimming pool should be managed well. Pool water needs to be equipped with a high-quality water quality testing tool. The following describes what items need to be tested for swimming pool water quality. Turbidity NTU: Due to the suspended and colloidal particles in the water, the original colorless and transparent water is turbid, and the degree of turbidity is called turbidity. The unit of turbidity is"Spend"It means that when 1L of water contains 1 mg of SiO2 (or non-straight mg kaolin, diatomaceous earth), the degree of turbidity produced is 1 degree. PH: The pH value is sometimes called the hydrogen ion index. Since the value of the hydrogen ion concentration is often very small, it is very inconvenient in application. Therefore, the concept of pH value is used as an indicator for judging the acidity and alkalinity of aqueous solutions. Moreover, the negative logarithm value of the hydrogen ion activity can represent the order of magnitude of the change range of acidity and alkalinity, which is very convenient for application, and thus obtained (at 25°C). Urea: This is a unique indicator in my country's swimming pool water quality standards. Urea in pool water mainly comes from human sweat, secretions and excretions. Urine contains more urea. Urea is an important indicator of the degree of human pollution in pool water. The total number of bacteria: the total number of bacteria refers to the total number of bacteria produced in 1mL of water samples in a nutrient agar medium after 48 hours of cultivation in an incubator at 36°C±1°C. The lower the total number of bacteria, the better the water quality. Escherichia coli: Escherichia coli exists in the human intestines. If there is a large amount in the pool water, it means that the pool water has been polluted by human feces, indicating that the pool water has been polluted by enterobacteria or there is such a possibility, reflecting In addition to insufficient disinfection or backwashing during system operation, bacteria may multiply in the filter. Free residual chlorine: Free residual chlorine refers to the concentration of chlorine disinfectant in the form of hypochlorite in pool water. It is stipulated that its purpose is to maintain the continuous bactericidal effect of the pool water, to inhibit the remaining bacteria in the water from multiplying again, to prevent cross-infection and to deal with the adverse effects of sudden increase in swimming load on the pool water quality. It can also be used as an indicator that the pool water is recontaminated. Under the conditions of meeting the total number of bacteria and the total coliform group, the free residual chlorine should be kept to a minimum. According to the information, 0.2mg/ml free residual chlorine can instantly kill Escherichia coli. Combined residual chlorine: Combined residual chlorine refers to the concentration of chlorine disinfectants that exist in a combined state such as chloramine in pool water. It is formed by the reaction of chlorine with pollutants in water, and as a result, the disinfection and sterilization ability of chlorine is reduced. The urea in the sweat, urine, etc. brought in by swimmers in the swimming pool is decomposed and continuously exists in the pool water, and the reaction product of chlorine and ammonia is chloramine. This is the combined residual chlorine in the standard. Ozone: Ozone is a very strong oxidant and disinfectant, represented by O3. It is a poisonous gas at normal temperature and has a larger specific gravity than air. Water temperature: The water temperature refers to the temperature of the swimming pool water. If the temperature of the pool water is too low, people will feel cold, prone to muscle spasms and heart disease. If the water temperature is too high, if it is higher than 30°C, it will speed up the sweat and fat secretion of swimmers, which will speed up water pollution. The indoor temperature and humidity will increase accordingly, harmful gases such as chloramines will not easily volatilize, and the environmental quality will deteriorate. The comfortable swimming water temperature should be in the range of 23~30°C, and the other water temperatures of different swimming pools are different. Total Dissolved Solids (TDS) 1. Total Dissolved Solids is an indicator of whether pool water needs to be diluted or refreshed. 2. Total dissolved solids refers to the sum of all inorganic substances, metals, salts and organic substances dissolved in the pool water. However, it does not include substances suspended in water. The use of disinfectants and other chemicals will increase the total dissolved solids. 3. The impact of excessive total dissolved solids on the pool body: the pool water will become turbid, chlorine will become ineffective, the pool water will change color, the filtration cycle will be shortened, and the pool water will produce peculiar smell. 4. The impact of too little total dissolved solids on the pool body: reduce the filtration effect and make the pool water appear slightly green. 5. This item is an unconventional inspection item in the new swimming pool water quality standard. Oxidation-reduction potential (ORP
), oxidation-reduction potential refers to the electrochemical voltage measured by means of electrodes, which indicates the ratio of oxidation potential to reduction potential in the monitored liquid, and is an indicator of the ability of disinfectants to kill bacteria. He has become an indicator of international water quality standards. ORP measures the strength of the disinfectant's oxidation ability, not the disinfectant content.
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