Iron Fighter® water softener salt pellets are specially formulated for water with high iron content. These 99.6% pure water softener salt pellets help prevent rust stains on laundry, fixtures, sinks and tubs. Virtually 100% water soluble, it also minimizes mushing, bridging and rust buildup in your water softener brine tank helping to keep your water softener running smoothly. Our patented two handled, 40 lb and 50 lb bags make lifting and carrying easier than ever. Recommended for most types of water softeners, particularly in regions of high iron water content.