ARMâ„¢ Fine has the highest solubility of any reactor media available (metastable at 8.2) so typical CO2 consumption is much lower. Product Data: Average Density: 69 lb/ft3 Calcium: 381,000 ppm Carbonate: 590,000 Strontium: 7390 ppm Magnesium: 1050 ppm Product numbers: 00525, 1 gal.; 00555, 50 lb