POTASSIUM CARBONATE (K2CO3) Dense granular, regular SPECIFICATIONS TOTAL ALKALINITY    99.5 min. KOH, WT%     0.10 max. K2O, WT%     0.50 max. KCI, ppm     100 max. K2SO4, ppm     75 max. SODIUM, ppm as Na    4100 max. IRON, ppm as Fe    2 max. NICKEL, ppm as N    1 max. HEAVY METALS as Pb, ppm   5.0 max