<Li> Tripolite is the variety found in Tripoli, Libya . </Li> <Li> Bann clay is the variety found in the Lower Bann valley in Northern Ireland . </Li> <Li> Moler (Mo - clay) is the variety found in northwestern Denmark, especially on the islands of Fur and Mors . </Li> <Li> Freshwater - derived food grade diatomaceous earth is the type used in United States agriculture for grain storage, as feed supplement, and as an insecticide . It is produced uncalcinated, has a very fine particle size, and is very low in crystal silica (<2%). </Li>

Where does food grade diatomaceous earth come from