Nitrate +Nitrate + contains concentrated nitrate to replenish depleted nitrate to the desired level in ultra-low nutrient systems (ULNS). Many issues can occur in ULNS, for example, loss in coral colour or bleaching, fatigued coral and slow growth from nutrient deficiency. Adding nutrients back into a ULNS will increase the zooxanthellae population. Overdosing will cause unwanted algae 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 0.1 ppm. Ingredients:– Demineralised water– Concentrated Nitrate @ 100000 ppm Caution: Not for human consumption Aquarium use only.Keep out of reach of children and pets. Storage: Keep out of direct sunlight.Always secure cap on.