BORONBoron is an essential minor element with an average seawater concentration of 4.4 ppm. It aids in the calcification process of coral skeleton and acts as a PH buffer to maintain a stable PH in your aquarium. Depleted boron can result in unstable PH and slower coral growth. Macroalgae and coralline algae use boron for steady growth. Directions:This product is to be used in conjunction with calibrated testing equipment or ICP-OES to determine depletion.2 drops (0.1ml) will raise 100L of aquarium water by 0.05 ppm. Ingredients:Concentrated Boron50,000ppm CAUTIONKeep out of reach of children and pets. Not for human consumption. For marine aquarium use only. StorageKeep out of direct sunlight.Always secure cap on.