ARM™ 

With the highest solubility of any reactor media available (metastable at 8.2) it’s typical CO2 consumption is much lower.

Contains:
381000 ppm Calcium, 590000 ppm Carbonate, 7390 ppm Strontium, 1050 ppm Magnesium, 56 ppm Potassium.
About 69 pounds per cubic foot
1 gal (00525)