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Chemically balanced formula to support the most delicate Corals and other marine life Reaches a stable, natural pH shortly after mixing Free of Nitrates & Phosphates Produced by a small batch process to ensure homogeneity and consistency of the salt mixture Corals, calcareous algae and other invertebrates use large amounts of Calcium for the building of their skeletons or shells. The Calcium level in natural seawater at 35ppt is approximately 400 ppm. The Coral Pro formula provides elevated levels of calcium at the "lower than natural" salinities preferred in reef aquariums. Table shows Calcium levels of Coral Pro mixed in RO water at 24°C 75°F and salinity.

s.g.	Salinity	Calcium	Qty of Salt
1.021	30.6 ppt	420 ppm	33.4 g/l 1.4 lb/5 US gal
1.023	32.8 ppt	450 ppm	35.8 g/l1.5 lb/5 US gal
1.025	35.0 ppt	480 ppm	38.2 g/l1.6 lb/5 US gal