The dried Monohydrate form of Ferrous Sulfate contains the greatest amount of Iron per ton (~30%) and the least amount of interior water (one molecule or ~12% by weight). At QC Corporation, dried Monohydrate is made in three sizes, Standard or powdered size (US Sieve Mesh Size -20 +100), Fine Granular (US Sieve Mesh Size of -16 +30) and Coarse Granular (US Sieve Mesh Size of -6 +16).

All three sizes of dried Monohydrate will not compact or cake in transit or in storage as long as it is not exposed to free water or temperatures in excess of 325° Fahrenheit. In addition, the higher Iron content of Monohydrate results in lower transportation, bagging and palletizing costs per pound of Iron by as much as 33% when compared to the same costs per pound of Iron contained in moist and dried Ferrous Sulfate Heptahydrate. The primary disadvantages of dried Ferrous Sulfate Monohydrate include its slower rate of solubility due to its higher Iron content and lower water content.