Humboldt Nutrients HNS400 8-Ounce, Sea Mag 1-3-4 Sea mag 1-3-4 is loaded with vital elements which help control cell division, cell growth, cell differentiation Designed to be a powerful additive for hydroponics and all growing mediums Can be used to supplement magnesium and to increase plant growth Supercharges your plant, supplies crucial elements that plants require and prevents and corrects potential nutrient deficiencies Complete nutrient feeding schedules provides excellent flower production, heavy yields and high quality fruits