Formulated for high iron water situations, this easy to use one shot 4 ounce packet restores water softener performance and also acts as a rust stain remover.  Recommended for all salt-based water softeners in iron-bearing water situations to eliminate iron buildup and to maintain water softener performance. Specially formulated by Magnetic Water Technology, a leader in residential and commercial water treatment, to dissolve iron buildup in the resin bed. Pour the packet in, then rinse with normal system regeneration. Simple to use. Do this about once every six months using a fresh packet. Larger quantity containers typically can become less effective over time, so buy fresh and stay fresh.  Simply pour the packet into your brine or salt tank, and regenerate. That's it.  We have spent 21 years developing our EBAY reputation for quality products and solutions to the world's water problems. We do ship worldwide.