Calcium Nitrate Tetrahydrate (CNT), with the chemical formula Ca(NO₃)₂·4H₂O, is a high-purity, fully water-soluble, chloride-free inorganic salt. It appears as white to transparent crystals or granules, with excellent solubility in water and moderate hygroscopicity.

Calcium Nitrate Tetrahydrate (Ca(NO₃)₂·4H₂O) is a highly water-soluble inorganic salt composed of calcium, nitrate nitrogen, and four molecules of crystallization water. It is one of the most important calcium fertilizers used in modern agriculture and is also widely applied in construction, wastewater treatment, chemical manufacturing, and environmental management.