Contains nearly 50 times the strontium of other brands (7390 ppm). It also contains 381,000 ppm Calcium, 590,000 ppm Carbonate, and 1050 ppm Magnesium. ARMTM Fine has the highest solubility of any reactor media available (metastable at 8.2) so typical CO2 consumption is much lower. Works with many Tunze, Precision Marine, Korallin, and Schuran reactors.