Emerald Harvest Cal-Mag (1 US qt / 0.95 L), Case (12 Qty), is a high-quality calcium and magnesium supplement designed to support optimal plant health and growth. This case contains twelve 1-quart bottles, making it ideal for growers who need a consistent and convenient supply of these essential nutrients.Calcium and magnesium are crucial for plant development.Calcium strengthens cell... https://www.hydroponicstown.com/cal-mag-1-us-qt-0-95-l