1. Methylene blue: Generally speaking, the higher the methylene blue value of powdered activated carbon, the better the decolorization effect.

2. Mesh size: Generally speaking, the smaller the mesh size of powdered activated carbon, the better the decolorization effect. The conventional mesh size is about 200 meshes. However, if the mesh size of powdered activated carbon reaches 300 meshes, the decolorization speed per unit time will increase a lot. However, because the activated carbon is too fine, it will cause troublesome defiltration in production.

3. PH value: Generally speaking, powdered activated carbon has the best decolorization effect under acidic conditions.