They Hydrosoft Salt Tablets are made with special care for water softness, Hydrosoft water softening salts dissolve evenly, so there are no problems with undissolved salt building up in the base of your water softener. Hydrosoft water softeners give optimum performance - especially when used with Hydrosoft salt tablets. Other makes of water softener will either use granular salt or salt tablets. Consult your literature to see whether the manufacturer recommends granules or tablets - Hydrosoft granular or tablet salt is 99.9% pure and suitable for use in all makes of water softener.