Closed System Water Treatment: Buyer Guide for Buildings

Closed heating and chilled water systems affect comfort, energy efficiency, plant life, and maintenance cost, so water treatment should not be treated as an afterthought.

Routine checks may include inhibitor levels, pH, conductivity, iron, copper, hardness, bacteria, glycol, corrosion indicators, and visual condition of strainers or filters.

A useful contractor explains what the results mean for pumps, valves, heat exchangers, boilers, chillers, and energy performance.

Common recommendations include dosing, side-stream filtration, flushing, dirt separation, air removal, or investigation of oxygen ingress.

Trend results over time because deterioration is often gradual and easier to correct before it becomes a breakdown or major clean.