Omya India Pvt. Ltd. Offers Natural Ground Calcium Carbonate - GCC based Filler. Omya India Pvt. Ltd. Supplies industrial minerals, mainly fillers and pigments derived from calcium carbonate and dolomite. Natural Ground Calcium Carbonate - GCC based Filler offer significant advantages over unfilled and uncoated grades. Natural Ground Calcium Carbonate - GCC based Filler gives a more pleasing finish. These fillers gather in the crevices and pores of uncoated papers to create a more uniform surface. Its brand name is Hydrocarb®.