Calcined diatomaceous earth has been treated at temperatures above 1500°F to agglomerate the diatoms creating a range of permeabilities for better filtering agents. It’s used primarily as a fine-to-ultra fine filter aid in beer, wine, chemicals, and pharmaceuticals applications.

The characteristic color of calcined diatomaceous earth comes from the oxidation of iron during calcination; it is sometimes referred to as “Pinks” for this reason. Our natural grades are off-white.