Arm ™ 

With the highest solubility of all available reactor environments (metastable at 8.2), typical CO2 consumption is much lower.

Contains:
381000 ppm of calcium, 590000 ppm of carbonate, 7390 ppm of strontium, 1050 ppm of magnesium, 56 ppm of potassium.
About 69 pounds per cube
1 gal (00525), 50 lb (00555)