Do it Water Softener Salt Cubes, 40 lb. with Resin Kleen keeps your water softener clean and maintenance-, helping to extend the life and efficiency of your appliance. This product effectively controls mineral build-up, eliminates the need for brine tank clean-outs, and ensures your softener operates at maximum efficiency. Made with 99.8% pure salt, these highly soluble cubes are designed to prevent bridging, mushing, and channeling. The 40 lb. pour bag is ready to use and convenient for maintaining your water softener system. Model Number: 766410