Aquasol Water Softening Tablets The market leading water softening salt has been further enhanced to provide users with the ultimate product. Aquasol salt briquettes are manufactured under the quality standard ISO 9001:2000 by British Salt, the UK's most modern salt producer. Aquasol is made from pure salt and then formed into small, pillow shaped briquettes, compressed to minimise chipping. Aquasol can be used for the regeneration of small to medium sized domestic water softeners and dishwashers. It has been formulated to dissolve efficiently without causing the formation of troublesome fine salt particles.