CalMagX adds additional calcium, magnesium and iron to plants, while helping to prevent nutrient deficiencies and optimizing plant nutrition. Perfectly suited for plants with high calcium intake. CalMagX adds additional calcium, magnesium and iron to plants, while helping to prevent nutrient deficiencies and optimizing plant nutrition. Perfectly suited for plants with high calcium intake. Available in 1 Quart 1 Gallon 2.5 Gallons 5 Gallons 15 Gallons 55 Gallons Refer to feeding schedules for amounts and usage.