DE Powder is the filtration media for diatomaceous earth pool filters. Our DE powder is of the highest quality and will provide you with outstanding filtration results that will leave your pool water sparkling clean. DE powder filters out contaminant particles as small as 3 to 5 microns. Now that’s clean! Fresh diatomaceous earth powder is required every time you backwash your DE filter and will keep your filter working at peak performance. After back washing, add 1 lb. of DE Powder per 10 sq. ft. filter area. DE Powder is lighter than other dry measures – 1 lb of DE powder is about equal to a 1 lb coffee can. Upon initial start up of a DE filter, with fully hosed-clean or new grids, you should add more DE Powder, perhaps 1 lb per 5-7 sq. ft. of filter area. Add a small amount more if you are cleaning green or hazy water.