Ultra Epsom Salt is the highest quality, pharmaceutical grade Epsom salt available. Ultra Epsom Salt brand of magnesium sulfate, exclusively from SaltWorks, is known for its exceptional purity and therapeutic value. It dissolves easily, perfect for soothing sore muscles, relaxing soaks, and calming foot baths. Create body scrubs, bath salts and much more with the new range of grain sizes available. Add Ultra Epsom Salt to your garden for lush, green lawns, roses and vegetables. Ultra Epsom Salt is affordably priced and offered in bulk in several unique grain sizes for multi-purpose use. Medium Grain: Ultra Epsom in Medium grain is a crystal size that works well for bath salts, body scrubs, sore muscle soaks and in gardening.