Explanation of several terms about swimming pool water

1. The total alkalinity of swimming pool water 1. In order to prevent the difficulty of pH adjustment, the total alkalinity of swimming pool water should not exceed 200mg/L (calculated as calcium carbonate). There is also information that the alkalinity should be 120mg/L and 250mg/L. In the past, the country did not pay enough attention to this and lacked practical data. This requires managers to explore in practice to find the data that suits them.

2. The total alkalinity of water is a measure of dissolved alkaline salts in water, such as bicarbonate and carbonate, and is a physical quantity to measure the ability of swimming pool water to resist changes in pH value. The greater the alkalinity, the more resistant the water is to changes in pH. Alkalinity has a buffering effect on water, and the purpose of controlling total alkalinity is to control the change of pH value.

3. In order to keep the alkalinity from affecting the pH value of the suitable disinfectant, it is very important to stabilize the pH value. Therefore, if the alkalinity of swimming pool water is less than 75mg/L (calculated as calcium carbonate), sodium bicarbonate should be added to increase the alkalinity; if the alkalinity of swimming pool water is greater than 200mg/L (calculated as calcium carbonate), sodium bicarbonate should be added Add hydrochloric acid or sodium bisulfate to reduce alkalinity. If an acidic disinfectant is used, it must be diluted by increasing the amount of hydrating water to reduce the alkalinity.

4. The optimal alkalinity range of swimming pool water is 60-200mg/L. The total alkalinity of swimming pool water should be greater than 75mg/L (calculated as calcium carbonate), so as to avoid large changes in pH value caused by changes in the concentration of disinfectants and pH value regulators. This data is also the minimum value at which coagulant coagulation is effective.

2. Swimming pool water hardness 1. The calcium hardness of swimming pool water has not attracted enough attention in the purification treatment of circulating water in swimming pools. If the hardness is lower than 40mg/L (calcium carbonate), it will be corrosive to the building materials of the swimming pool; if the calcium hardness exceeds 160mg/L (calcium carbonate), scale and sediment will form, affecting the swimming pool Pool water turbidity and heating equipment efficiency. 2. Calcium hardness should be controlled within the range of 200-450mg/L.

However, there is no unified understanding of the harm caused by calcium hardness. 3. Total dissolved solids 1. Total dissolved solids (TDS) refers to the total amount of dissolved substances in water. Disinfectants and other chemicals inevitably add significantly to the amount of total dissolved solids.

It will affect the transparency, comfort, sterilization efficiency, taste of water and many foams will be produced on the water surface of swimming pool. 2. The concentration of total dissolved solids in swimming pool water is generally calculated by using electronic instruments to measure the conductivity of water according to the following formula: TDS=conductivity*0.7 (mg/L) 3. The value of total dissolved solids in swimming pool water can be used as an overload Cause too many chemicals or not enough diluted parameters. The only way to reduce the value of total dissolved solids is to dilute with water.

4. Control the amount of total dissolved solids, and dilute the swimming pool water by supplementing 30L of fresh water for each swimmer every day and backwashing the filter equipment in strict accordance with the regulations. 5. The quality of swimming pool water and raw water should be monitored. It is recommended that the value of total dissolved solids be maintained within the range of 1000-2000mg/L. 1500mg/L is the best, but the total should not exceed 3000mg/L.

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