How do you protect your steam boiler from scale, corrosion and oxygen pitting; and at the same time protect your condensate return lines from corrosion, without needing to use two to three different products? United 419 does it all. BOILERMATE PLUS contains: sulfite to control dissolved oxygen and prevent pitting; synthetic polymers to prevent scale and condition sludge for easy removal by blowdown; sequestrants to control hardness and prevent scale; and volatile amines that pass out of the boiler to prevent corrosion of steam and return lines.