If you are looking for water softening solutions in the area, specialized equipment suppliers can provide similar high-purity tablet salts:
Dura-Cube (by Cargill) is a premium, dealer-exclusive water softener salt, meaning it is primarily sold through rather than standard big-box hardware stores. Where to Find Dura-Cube Salt
Many regional providers offer scheduled delivery directly to your brine tank. Notable providers include Besco Water Treatment and Rochester Water Conditioning .
Select independent farm supply stores, such as Pettigrew Feed & Hardware or Sharpe Farm Supplies , carry Dura-Cube in 40lb and 50lb bags.