Diatomaceous Earth is a naturally occurring, soft, siliceous sedimentary rock that is easily crumbled into a fine white to off-white powder. It is used mainly in applications to neutralize insect pests. The microscopic crystalline structures damage the exoskeleton of most insects causing them to dehydrate and lose mobility resulting in death. There are food grade version of DE and some humans claim ingesting as much as a spoonful a day has health benefits. Because of this many feel it is an effective safe alternative form of pest control.