Effect of circulating water concentration ratio on pH value

The pH value that can be achieved in circulating water is determined by multiple parameters; merely pH and alkalinity are not sufficient to determine it. There are now formulas that can be used to estimate the natural pH value of circulating water. If the alkalinity of the water used for making up the water in your system is below 150 ppm, and if the total hardness is not higher than 300 ppm, then this water belongs to the Yangtze River water system. The calculation formula is as follows: pH = 6.78 + 0.204 × pH_of_replacement_water + 0.094 × N + 0.0022 × alkalinity_of_replacement_water. Here, pH_of_replacement_water refers to the pH of the water used for replacement, N represents the concentration factor, and alkalinity_of_replacement_water refers to the alkalinity of that water. Based on your data, the natural pH of the circulating water should be 8.9; I’m not sure if this is correct, so I hope everyone can discuss it together.

None of your calculations give an accurate value. During the process of achieving the desired concentration ratio, some scale is formed to a greater or lesser extent; this scale consumes carbonate ions, which in turn means that alkalinity is used up. Moreover, to achieve the desired concentration ratio, scale inhibitors must be added, and these inhibitors are usually acidic in nature, thus consuming more alkalinity as well. Therefore, it is difficult to carry out accurate calculations.

Theoretically, as mentioned on the second floor, but in practice there can be differences. When there are no actual values, this is the only way to calculate it. What do everyone think?