EZ Spa Cal

 This fast-dissolving granular formula is designed to raise the calcium hardness in spa water. As a balancer and water hardness increaser, it is odorless and has a pH rating of 8.3 - 8.4 at 20 degrees Celsius. Its solid white flakes have a solubility of 42 wt% (Anhydrous) at 68 degrees Fahrenheit, and a specific gravity of 1.5. This product belongs to the inorganic calcium salts chemical family.