Magnesium Sulfate Epsom Salts Magriculture OMRI, 50lb High Pressure Sodium (HPS) Bulbs Measure carefully and follow the Measure carefully and follow the label rather than assuming that a heavier application will produce better results 2 inches 1200 mm) Water Pump Included with the Kit: Model: V SYSTEM Vortex Water Pump 370W 120V 13200 l h Wattage: 370 watts Flow Rate: 3487 gal hr (13200 L hr) Recommended water chiller minimum capacity: 264 gallons (1000 L) CAD Drawing PDF Gardeners have been using Epsom salts as a plant fertilizer for years because they contain both magnesium and sulfur for crops with high magnesium demand