Polyaluminium Chloride (PAC) powder typically comes in several colors, which can range from  light yellow to dark brown or even white color, grey. The color variation is primarily due to differences in the manufacturing process and the degree of polymerization, as well as the content of impurities or unreacted components.

1. Light Yellow PAC: This lighter-colored variety often indicates a higher purity product with lower impurities content and a higher aluminum chloride content. It's usually used for water treatment applications where minimal impact on treated water color and a higher coagulation efficiency are desired, such as in drinking water purification.

2. Dark Brown or Grey PAC: Darker shades of PAC usually denote a higher level of impurities like iron or a higher degree of hydrolysis. These types of PAC may have more pronounced coagulating and flocculating properties and might be more suitable for treating wastewater with complex contaminants or requiring a stronger coagulant effect.

3. White Polyaluminium Chloride (PAC), also known as high purity PAC, is a variant with a distinct white or off-white color. This hue indicates an exceptionally high degree of purity and low levels of impuritie. White PAC is commonly used in the purification of drinking water due to its high purity and minimal impact on the treated water's color, taste, and odor.

Keywords: PAC, Poly aluminum Chloride, poly aluminium chloride, Polyaluminum Chloride, PACL, Coagulant

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