The colors of polyaluminum chloride are generally white, yellow, and brown, and different colors of polyaluminum chloride also have significant differences in application and production technology. Polyaluminum chloride, with a content of 27% to 30% of alumina within the national standard range, is mostly a solid powder in the form of earthy yellow, to yellow, or light yellow. These types of polyaluminum chloride have good water solubility and are accompanied by physical and chemical changes such as electrochemistry, coagulation, adsorption, and precipitation during the dissolution process. The formation of flocs is fast and coarse, with high activity, fast precipitation, and significant purification effects on high turbidity water.

White polyaluminum chloride is called high purity iron free white polyaluminum chloride, or food grade white polyaluminum chloride. Compared with other polyaluminium chloride, white polyaluminum chloride is a product of high quality. The main raw materials are high-quality aluminum hydroxide powder and hydrochloric acid. The production process adopted is the spray drying method, which is an advanced domestic technology. White polyaluminum chloride is used in various fields such as papermaking sizing agents, sugar decolorization clarifying agents, tanning, pharmaceuticals, cosmetics, precision casting, and water treatment.

The raw materials of yellow polyaluminum chloride are calcium aluminate powder, hydrochloric acid and bauxite, which are mainly used for sewage treatment and drinking water treatment. The raw materials for drinking water treatment are aluminum hydroxide powder, hydrochloric acid, and a little calcium aluminate powder. The process adopted is the plate and frame filter pressing process or spray drying process. For the treatment of drinking water, the country has strict requirements for heavy metals, so both raw materials and production processes are better than brown polyaluminum chloride. Yellow polyaluminium chloride is generally produced by drum drying or spray tower drying, and has two solid forms, namely, flake and powder.

The raw materials for brown polyaluminum chloride are calcium aluminate powder, hydrochloric acid, bauxite, and iron powder. The production process adopts the drum drying method, which is generally used for sewage treatment. Due to the addition of iron powder, the color is brownish brown. The more iron powder is added, the darker the color. If the amount of iron powder exceeds a certain amount, it is also called polyaluminum iron chloride, which has excellent effects in sewage treatment.