However, in acidic media, its growth and growth is relatively fast, that is, the acidic environment is a hotbed of bacterial microbial growth. Therefore, some swimming pools often adjust the pH of the swimming pool water to the national standard high position (7.6~8.0), and do not give the bacteria and microbes breeding opportunities. This will reduce the chance of water deterioration. However, too high a pH value will make the swimming comfort of the visitors lower. If the PH value of the swimming pool is too high, the swimmer will feel uncomfortable!
How to adjust the PH in the pool
Generally, sodium carbonate and sodium hydroxide are used in combination with pH. Sodium carbonate is commonly known as soda and soda ash. White powder or fine crystal, miso, soluble in water, its solution is alkaline due to hydrolysis, high temperature is easy to decompose, long-term exposure to the air can absorb the moisture and carbon dioxide in the air to form sodium bicarbonate and agglomerate. The content is generally greater than 98%, the sodium carbonate is divided into food grade and industrial grade: the food grade is greater than 99%, the food grade price is slightly higher than the industrial grade, and the swimming pool is preferably selected from the food grade. As for the addition amount, it needs to be determined according to the on-site measurement to add the pH value of the measured water to the standard. It is best to add 15~20kg to 1000m3 water. Sodium hydroxide, also known as caustic soda, is fluid and solid. It is generally convenient to use and transport flaky caustic soda. It has strong hygroscopicity and corrosiveness, is easily soluble in water, exotherms when dissolved, and the aqueous solution is alkaline and has a slippery feel. It has strong alkalinity and is used to adjust the PH value of water. The dosage is less adjusted, but its irritating effect is high. For example, swimming pool water often uses it, and the water has a slippery feeling. It is recommended to use food grade sodium carbonate for swimming pool and less caustic soda.
Whether using sodium carbonate or sodium hydroxide, the pH should be dissolved first, then added by the dosing pump, or directly into the inlet of the swimming pool circulating water, and the circulating pump is started to push the water to evenly distribute it.
The pH of the swimming pool water is specified in the range of 6.8-8.2, with the best range being 7.4-7.6. First of all, this pH value is not irritating to the human skin and eyes, and is more comfortable; the most important thing is that in this pH range, the disinfection effect of the disinfectant can be ensured and the remaining chlorine can be maintained for a longer period of time. This is because the chlorine disinfectant will hydrolyze to hypochlorous acid HOCL and hypochlorite OCL- in water, while the main oxidation and disinfection and algaecide action is hypochlorous acid HOCL, which is different when using the same amount of drug. Hypochlorous acid HOCL and hypochlorite OCL- have different ratios at pH, which means that free available chlorine has different percentages of activity at different pH values. When the pH of the water is greater than 8.0, what happens in this case? At this time, most of the pool water is hypochlorite OCL-, and hypochlorous acid HOCL (residual chlorine) only accounts for a small part, which will undoubtedly greatly reduce the activity of the disinfectant in water, thereby affecting algae killing and sterilization. The effect will eventually lead to the flooding of green algae in the pool water, and it will continue to be banned; it will also cause you to detect low or even undetectable residual chlorine, so this is not a problem of the quality of the disinfectant, but the result of improper pH control.
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