For best results, use only "greenhouse grade" calcium nitrate fertilizer in your hydroponic growing system. You will have less residue and sediment from mixing and less plugging of your feed lines and drippers. 15.5-0-0

Greenhouse grade calcium nitrate for plants is a refined, prilled (uncoated) highly soluble fertilizer.

• Total Nitrogen (N) ................................. 15.5%
  • 1.0% Ammonia Calcium Nitrate
  • 14.5% Nitrate Nitrogen
• Calcium (Ca) ........................................ 19.0%
  • 19.0% Water Soluble Calcium

Calcium nitrate - SDS