Polyamine is liquid cationic polymers of different molecular weight which work efficiently as primary coagulants and charge neutralization agents in liquid-solid separation processes in a wide variety of industries. Applications The product can be used to mix with inorganic coagulants, such as polyaluminium chloride or aluminum chlorohydrate for treatment of low-turbidity waste water or tap water. It can also be used in purification of waste water from oil-field, or as anionic trash catch in white water system in paper making.