Ca-Mg-Fe is designed specifically for fast-growing, light-loving plants, especially where growing occurs under HID lighting. Ca-Mg-Fe is a fully soluble and super concentrated solution of calcium, magnesium and iron chelates. To ensure protection against a large spectrum of ‘high pH’ deficiency symptoms, Ca-Mg-Fe also contains high levels of ‘alkaline-stable’ essential trace elements such as chelated copper, manganese and zinc, plus molybdenum and boron.