Poly(diallyldimethylammonium chloride) solution is widely used in water treatment processes as a flocculant to remove suspended particles and clarify water. It is effective in binding to negatively charged particles, allowing them to clump together and settle out of the water. In the paper industry, it serves as a retention aid and drainage enhancer, improving the efficiency of paper production by increasing the retention of fine particles and fillers. Additionally, it is utilized in the textile industry as a dye fixative, enhancing the color fastness of fabrics. In cosmetics and personal care products, it acts as a conditioning agent, providing smoothness and manageability to hair. Its antimicrobial properties also make it suitable for use in certain disinfectants and sanitizers.