PolyDADMAC is mainly used in water treatment processes. It serves as a primary organic coagulant in wastewater treatment, reducing sludge volume and neutralizing negatively charged particles. In the paper industry, it controls substances that interfere with the papermaking process. As a flocculant, it aids in water clarification and is involved in drinking water treatment for turbidity and pathogen removal. Additionally, it's used in mining, mineral processing, drug delivery, chemical sensors, and biomedical systems.