4212 features: -Direct replacement for Diatomaceous earth, safe for use in all D. E. Filters. -D. E. Is a carcinogen, & it is safer to use a D. E. Alternative. -1/2 lb. Perlite = 1lb. D. E. . -Save money using less filter media. -Filters down to 3 microns. Chemical Type: -specialty chemicals. Package: -Opening. Country of Manufacture: -United States. Dimensions: Overall product weight: -13 5 lbs.