This case is specially with the "ADARO COAL" of Kalimantan, Indonesia, which contains only 1 % ash and 0.1 % sulphur.
Ang ganitong kaso ay kadalasang nagyayari pag gumamit ng “ADARO COAL” ng Kalimantan, Indonesia. Ito ay naglalaman lamang ng 1% abo at 0.1% sulfur.