Dyna-Gro Mag Pro Liquid Nutrients can be used with any complete nutrition formula and uses a high phosphorus, magnesium, and sulfur blend to bring out the color, fragrance, and size in fruits, flowers, and many vegetable crops. About Hydrofarm, Inc. Celebrated as the nation's oldest and largest manufacturer of hydroponic equipment and grow lights, Hydrofarm has made professional-grade equipment available to all since 1977. All grow lights and electric components are UL listed, unlike many competitors' products, meaning you get years of reliable and safe use out your high-intensity lights. All products are covered by a one year warranty, at the least. In some cases Hydrofarm ensures the performance of their products for five years. Use with any complete nutrition formula. Helps blossoms bloom larger and brighter. Also works with fruits and vegetables. Contains phosphorus, magnesium, and sulfur. Package measures 2.5L x 5.2W x 5.3H.