How to distinguish different content of PAC? Polyaluminum chloride due to the content of different colors presented more varied, such as the appearance of powder flake, the color of yellow or yellow and khaki brown and so on. With the production process of PAC and the change of raw materials, for many customers, it is not so easy to really distinguish the PAC content with the naked eye. The easiest way, with its own eyes. Polyaluminium chloride will be placed in the sun, if it is 30 content of PAC are generally shiny golden or yellow, 28 content is also shiny but slightly pale yellow color. If the non-standard content of about 25 if the color is even deeper. In general, within the scope of the national standard 27-30 content of PAC is yellow or light yellow solid powder, and soluble in water, has a strong bridge adsorption. In the process of hydrolysis, the [Al2 (OH) 3 (OH) 3] α ↓ is formed with the physicochemical changes such as electrochemistry, agglomeration, adsorption and precipitation, so as to achieve the purpose of purification. Polyaluminum chloride without adding other additives, flocs formed quickly and coarse, high activity, fast settling, the effect of high turbidity water purification obvious. The PH value to adapt to a wide range of pipeline equipment without corrosion. Another way to tell the difference between the quality of the PACA product quality method can also be judged by water insolubles. To a mineral water bottle filled with water. Take the right amount of test polyaluminum chloride into the bottle, capping vigorously shaken until the polyaluminum chloride completely dissolved. Then stand for an hour, observe the bottom of the water insoluble sediment deposition, the less the better.