Polyacrylamide is a long-chain synthetic polymer that acts as a purifying agent.

With lofty molecular weight, it has little use level, big flock, high sedimentation rate, wide application range, low cost, ect advantages. It can be divided into anionic polyacrylamide(HPAM), cationoid polyacrylamide(APAM) and nonionic polyacrylamide(PAM).