Overview Higher levels of calcium, magnesium and carbonates than the previous version of Red Sea Salt. Makes tap water ideal for inverts, low nutrient SPS, fish only and established marine systems. Formula also contains all 70 naturally occurring major and minor trace elements. Does not contain nitrates or phosphates. When mixed to the salinity of 33.5 ppt. (1.026 specific gravity), it provides the following levels: KH - 7.3-7.7�dKH, Ca - 390-410mg/l, Mg 1170-1230 mg/l. Harvested naturally and in an eco-friendly manner from the Red Sea.