Cronk Nutrients™ CalMag 2-0-0, is a concentrated combination of readily available calcium, magnesium and Iron that are critical throughout all stages of growth. Use as part of your regular feeding schedule to help prevent blossom end rot and tip burn in your “tomatoes”, lettuce, and other calcium intensive plants. Cronk's CalMag 2-0-0 is a soluble solution that will not clog hydroponic lines or any type of spear lines. It can be combined with any other of our nutrients in the Cronk Nutrients™ line.