Aqua Plus tablet salt is manufactured from food grade Pure Dried Vacuum (PDV) salt.  Aqua Plus tablet salt contains ≥99.5% Sodium Chloride. It has no impurities nor smell. When used in brining, it also delivers clear and maximum salinity into your resin tank making the regeneration process more efficient. Aqua Plus tablet salt leaves no  sediment nor create any bridging under the salt tank that could build up over time and cause damage in the filtration system of the softener unit.