Hydrax 1976 is a blend of tannins, polymers and alkalis formulated as a liquid to provide a convenient and simple water treatment for package boilers. Hydrax 1976 provides an optimum balance of boiler alkalinity and scale and corrosion inhibition without the need to prepare several components. The inclusion of tannin oxygen scavengers and corrosion inhibitors reduces the tendency towards priming and the extent of blowdown necessary.