Untreated boiler feed water causes two expensive problems over time — scale that reduces heat transfer efficiency, and corrosion that shortens equipment life. Boiler water treatment programs address both.
Scale Prevention
Hardness minerals in feed water can precipitate as scale on boiler tubes, which insulates the metal from the water it's meant to be heating — even a thin scale layer meaningfully cuts heat-transfer efficiency and increases fuel use. Sodium Hexametaphosphate (SHMP) and other phosphate-based treatments are commonly used to keep residual hardness in solution rather than letting it deposit as scale.
See Sodium Hexametaphosphate (SHMP) Technical.
Oxygen Scavenging
Dissolved oxygen in feed water accelerates corrosion inside the boiler system. Hydrazine hydrate is a classic oxygen-scavenging chemical used in boiler water treatment to react with and remove dissolved oxygen before it can attack metal surfaces — it requires careful, trained handling given its toxicity, and dosing should follow your boiler manufacturer's and water treatment specialist's guidance closely.
Alkalinity and pH Control
Maintaining correct alkalinity and pH in boiler water protects against both corrosion (at too-low pH) and caustic embrittlement/foaming issues (at excessively high pH or alkalinity) — this is a balance managed through ongoing water testing and adjustment, not a one-time dose.
Working With a Water Treatment Program
Boiler water chemistry is one of the areas where a formal, monitored treatment program genuinely pays for itself in fuel savings and equipment life — this overview is a starting orientation, and we'd recommend working with a water treatment specialist to design dosing specific to your boiler type, feed water quality and operating pressure.