Contains a balanced solution of strontium and trace elements that are essential for calcification, colour, overall health and vitality for all inhabitants in your reef aquarium. Reef Revolution's Elements A is designed to replenish depleted elements used by coral, fish and other organisms in your reef aquarium. For more information on individual elements, see our elements range on our website. Directions: PROFESSIONAL USE ONLY This product is to be used in conjunction with calibrated testing equipment or ICP-OES to determine depletion. 2 drops (0.1ml) of Elements A in 100L of water raises the strontium level by 0.05 ppm. -Demineralised water -Strontium, Barium Strontium @ 50000ppm CAUTION Keep out of reach of children and pets. Not for human consumption. For marine aquarium use only. STORAGE Keep out of direct sunlight. Always secure cap on.