GT Liquid Cal Mag Nitrate is a hydroponic supplement that can be used to fix issues with plant deficiencies in hydroponics, aquaponics and even soil gardening. Growth Technology's Calcium, Magnesium and Nitrogen supplement is long trusted and well know in the hydroponics scene. We have also used it in Aquaponics with fast reaction's in the plants too. Often deficiencies in plants leading to requiring Liquid Cal Mag Nitrate, includ lacking green growth, slow growth, and lack of vigour.