15+ Years of Predictable Water Treatment Performance in a High-Risk Commercial Environment

At a glance

A 1.5M+ sq. ft. downtown Calgary office and retail complex required uninterrupted cooling and closed-loop water treatment from construction through long-term operation. Guardian designed and continues to manage a site-specific program controlling microbiological risk and corrosion for 15+ years.

Key metrics

15+ YEARS OF EFFECTIVE TREATMENT

STABLE MICROBIOLOGICAL CONTROL

ZERO TRANSITION DISRUPTION

What a large commercial tower asks of its water treatment program

A multi-tower office and retail complex runs condenser water and closed-loop systems all year. Occupants expect cooling and comfort every day, so there is little room for downtime. Cooling towers also carry Legionella risk, which building operators have to control and document.

Over a building’s life, the systems keep changing. Construction, commissioning, tenant fit-outs and equipment changes all shift how water moves and how chemistry behaves. A treatment program has to hold steady through all of it.

This 1.5 million+ square foot downtown Calgary complex needed that stability from the day construction started, and it needed the records to show it.

Challenges

A multi-tower, commercial high-rise commercial in downtown Calgary operates complex condenser and closed-loop systems with year-round demand. From initial construction to full occupancy, the systems faced ongoing risk from corrosion, scale, microbial growth, and Legionella exposure.

The site required stable, compliant performance without disruption, despite ongoing system changes.

Solutions

Guardian partnered with the operations team to keep condenser and closed-loop performance predictable from construction through steady-state operation.

The program focused on dual-biocide microbiological control, closed-loop corrosion protection, routine verification, and disciplined documentation, with adjustments as conditions changed and local support to keep execution consistent.

Results

15+ years without treatment-related outages: No unplanned outages attributed to the program.

Controlled microbiological and Legionella risk: Routine monitoring maintained control under year-round operation.

Stable through system changes: Performance held through construction, commissioning, and equipment/operating changes.

Simplified day-to-day oversight: Documented routines and reporting simplified day-to-day governance.

Data

The data reflects long-term, real world operation of a large downtown commercial facility with continuous cooling and closed-loop demand.

Performance stability has been maintained from construction through commissioning and steady state operation, despite system modifications and evolving compliance regulations.

Rather than a single intervention, results reflect sustained control verified through routine monitoring, documented service records, and ongoing program governance over more than 15 years of active operation.