Calcium Nitrate Solution Grade Fertilizer Water Soluble Hydroponics"Greenway Biotech Brand" 10 Pounds Calcium Nitrate Solution Grade Fertilizer 100% Water Soluble (Ammonium Calcium Nitrate) Great for hydroponics Contains 15.5% Nitrogen (1% Ammoniacal Nitrogen and 14.5% Nitrate Nitrogen) and 19% Calcium Repackaged into smaller sizes