Phone Compatible Phone, sfa272 safeDE is extremely Pure safeDE is "Food Grade" by FDA standards safeDE is Naturally Organic safeDE Diatomaceous Earth is known to be more effective than other Food Grade Diatomaceous Earth brands due to the freshwater mine and the milling process that preserves the shape and strength of the diatom safeDE is a Freshwater Diatomaceous Earth (very hard shell and tubular in shape)