Flocculant is used to remove or reduce water turbidity or suspended solids, and to speed up the impurities in the water and sludge settling velocity chemicals. The first application of the flocculant is an inorganic flocculants, such as alum, ferric chloride. Organic and polymer flocculant is widely used in the future water supply and waste water treatment flocculant. Can be divided into anionic flocculant, such as carboxymethyl cellulose, sodium polyacrylate; cationic flocculants such as polyethylene amine; non-ionic flocculants, such as polyacrylamide. Their role in flocculation by charge neutralization and adsorption bridging role. The flocculant widely used in the purification of drinking water and industrial water supply, industrial waste water and residue processing; textile sizing agent, paper strengthening agent, food processing, household chemicals, leather tanning and dyeing and other industries. Polymer flocculant requirement in the future are still expected steady growth in recent flocculant used in oil exploitation three times. Anionic and non ionic requirements remain unchanged, the cationic growth of 20%.