Nature's Wisdom Food Grade DE Diatomaceous Earth, 10 lb. Description Natures Wisdom de is extremely pure. It is important to have a consistent shape diatom & no unwanted sediment. The shape of the diatom must be tubular with holes on the walls. It must be fresh water because the diatoms form a harder shell and is less fragile than those in salt water. Salt water deposits contain a mix of diatom species. These deposits shapes and sediments are inconsistent making them unusable for our products. Out of 600 deposits in the US only 4 are considered "food grade". Other food grade deposits still may contain higher amounts of sediment & clay that make them less effective. We have Analysis of many other "food grade" deposits and we are satisfied that we still obtain the highest quality Diatomaceous Earth for our products from the purest fresh water source. Actually, de is not an earth. It is the fossilized remains of microscopic shells created by one celled plants called diatoms. Features: 100% Freshwater Diatomaceous Earth with absolutely no additives or fillers Mined in the USA - Our pure white food grade diatomaceous earth is mined in Nevada Packaged professionally in stainless steel machinery on a dedicated line Sealed Air Tight Bags Use this to Refill our 1 and 3 Lb. Jars Product Details: Package Dimensions: 15 x 14.8 x 6.6 inches Item Weight: 10 pounds Manufacturer: Natures Wisdom Country of Origin: USA Item model number: DE-10 Is Discontinued By Manufacturer: No