ASTRA WT BOS1212 is a high performance, blended liquid boiler water treatment based on sulphite/sulfite which combines the functions of an oxygen scavenger, alkalinity builder, phosphate treatment and sludge conditioner. ASTRA WT BOS1212 is an ideal all-in-one water treatment chemical for low pressure steam boilers using softened make-up water. ASTRA WT BOS1212 reacts with oxygen to form products which have no adverse effect on boiler integrity. One of the components of ASTRA WT BOS1212 enhances protection against caustic embrittlement.