Continuum Aquatics 600-gm. Reef Basis Strontium Dry
Reef•Basis Strontium is a high purity strontium in dry form, designed to safely raise the strontium level in marine aquariums, providing essential strontium for aragonite formation and coral and other invertebrate growth. It contains no acetate, EDTA, polygluconates and is much stronger than many competitor's products because it is made from anhydrous salts, not hydrated salts.
Continuum recommends that you maintain a strontium level of 8 to 13 mg/L (ppm), a calcium level of between 410 and 450 mg/L (ppm), an alkalinity level of 7 to 11 dKH (2.5 to 4 meq/L), and a magnesium level of 1250 to 1350 mg/L (ppm). Note: Aquarists keeping SPS corals should consider keeping alkalinity at 7 to no more than 9 dKH (2.5 to 3.21 meq/L).