GH Calimagic Pro SeriesCALiMAGic Professional is a concentrated blend of readily available 5% of calcium and 1. 5% of magnesium. It is formulated to assist fast growing plants by preventing secondary nutrient deficiencies. CALiMAGic Professional helps optimize plant nutrition, and enhances plant growth and development. Prevents blossom end rot and tip burn in many crops, such as tomatoes, lettuce, as well as other calcium intensive plants. Inquire for prices of 55gal 275gal