Sodium Meta Bisulfite (Na2S2O5) also called as sodium pyrosulphite, meta bisulfite and disodium. It is used as a food additive and in sanitation as a cleaning agent. Concentrated Sodium Meta Bisulphite is used to remove tree stumps. Sodium Meta Bisulfite is encountered occasionally as a food preservative with the combination of sulphur dioxide in sweets and moist foods, especially in the foods that contain coconut flavors.