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Overview 
  High-purity powdered calcium.
 
  Increases the concentration of calcium in marine aquarium 
 water to provide corals and other reef-building invertebrates 
 with one of the most important elements required for growth.
 
  Stronger and more economical than liquid calcium solutions; 
 created for hobbyists maintaining multiple reef aquaria.
 
  Formulated by a marine scientist.
 
 It is recommended that the calcium concentration in the aquarium be determined  by using an accurate test kit prior to supplementing. Do not add this product  directly to an aquarium containing live animals without first diluting in water  as directed.
 
 Technical Background
 Calcium is required for the formation of aragonite, the skeletal material of  reef-building invertebrates such as corals, clams, tube worms, and their  respective allies. In reef aquaria, maintaining calcium within a range of 412 -  450 ppm will enable corals and other reef-building invertebrates to grow rapidly  when all other physical and chemical requirements are met. [Magnesium,  strontium, and carbonate ions are also complexed into aragonite, and their  importance in a reef aquarium cannot be overstated.] The rate at which calcium  is extracted from the water is determined by the stocking density of  reef-building livestock, type of lighting, and other biological, physical, and  chemical conditions; therefore, each aquarium will have different requirements  for the rate of calcium supplementation. 
 
 Instructions and Guidelines
 Basic : Dissolve 2 grams (~