FoxFarm Bush Doctor® Cal-Mag (1 pint) is an OMRI Listed® and CDFA Registered liquid plant supplement designed to prevent blossom end rot and tip burn by providing essential Calcium (\(3\%\)) and Magnesium (\(0.9\%\)) to strengthen cell walls. It is formulated for both soil and hydroponic systems with a 1-0-0 NPK ratio.