Diamond Crystal Iron Fighter Salt Pellets (up to 99.6% pure salt) contain an FDA-approved, highly effective rust remover which helps to prevent rust stains on laundry and household fixtures. It is recommended that you use these Iron Fighter salt pellets in most water softeners, as directed by the manufacturer. These rust remover salt pellets come in a 40 pound bag. For assurance, the water softener salt pellets come with a limited warranty.Note: Brand may vary by store. Please check your Tractor Supply Company store for availability.