PolyDADMAC(PD LS20), is a cationic linear polymer which can completely dissolved in water, it contains strong cationic radical and activated adsorbent radical, which can destabilize and flocculate the suspended solids and the negative-charged water soluble matters in the wastewater through electro-neutralization and bridging adsorption. It achieves good results in flocculating, de-coloring, killing algae and removing organics.