PDV Water Softening Tablets- 25KG Bag Pure Dried Vacuum Food Grade Salt Tablets Water Softening Tablets Increase Efficiency of Industrial Cleaning Units Conforms to British Safety Standards 25kg Bag Made from High Purity Salt Pure Dried Vacuum (PDV) Water Softening Tablets are ver pure refined salt tablets, and are made so that they won't chip, but will dissolve efficiently so they won't leave any residue in your water softening system, resulting in less maintenance. Softens Hard Water The tablets dissolve quickly and will increase the efficiency and preserve the life of cleaning units and boilers and will reduce detergent and chemical use in laundries. Great for Domestic and Commercial Water Softeners These tablets are ideal for hotels, hospitals, laundries, restaurants, large factories, and applications such as reverse osmosis. Conforms to BS EN 14805:2005 and BS EN 973:2009.