Diatomaceous earth is mainly obtained by roasting, pulverizing and grading to obtain shaped products, and its content is generally required to be at least 75% or more and organic matter content below 4%. Most of diatomaceous earth is light in weight, small in hardness, easy to crush, poor in consolidation, low in dry powder density (0.08~0.25g/cm3), can float on water, pH value is 6~8, it is ideal for processing wettable powder Carrier. The color of diatomite is related to its purity.