Do it Best 40 Lb. Water Softener Salt Cubes with Rust Remover

Water softener salt with rust fighting additives prevents iron deposit build-up, and prevents iron and rust discoloration on sinks, dishes, toilets, cookware, and laundry. Eliminates brine tank clean-out. Highly soluable, 99.8% pure salt. Product sized to eliminate bridging, mushing, and channeling. 40 lb. bag.