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# bags make lifting and carrying easier than ever. Recommended for most types of water softeners, particularly in regions of high iron water content.