A product which comprises a sulphite or a bisulphite and one or more additives selected from the group comprising a metal sequestering agent, a pH modifier and scale inhibitor, for simultaneous,

Sodium hydrogen sulfite or sodium bisulfite is a chemical compound with the chemical formula NaHSO₃. Sodium bisulfite is a food additive with E number E222. Sodium bisulfite can be prepared by bubbling sulfur dioxide in a solution of sodium carbonate in water. Sodium bisulfite in contact with chlorine bleach (aqueous solution of sodium hypochlorite) will release harmful fumes

Potassium bisulfite is a chemical compound with the chemical formula KHSO₃. It is used during the production of alcoholic beverages as a sterilising agent.