SubZero Blasting

Confined space, boiler entry, and zero room for mistakes.

We were recently on site at the in Toronto, one of the largest wastewater treatment facilities in Canada and among the biggest in North America. Originally built in the early 1900s and expanded over decades, this facility plays a critical role in treating wastewater for the city and surrounding areas.

Our scope was confined space cleaning inside a boiler system, removing calcium buildup as part of preventative maintenance. Over time, this type of buildup reduces efficiency, restricts flow, and can lead to larger mechanical issues if not addressed properly.

This was not an easy environment.

Tight quarters, limited access, restricted airflow, and the potential for gas buildup meant everything had to be controlled and monitored at all times. Our confined space team followed strict entry procedures, continuous gas monitoring, ventilation setup, and full safety protocols before and during entry.

Once inside, the work required precision.

Calcium deposits had formed throughout the internal surfaces, and removal had to be done carefully to avoid damaging the system while still achieving a thorough clean. Every section had to be accessed and cleared properly to ensure the boiler could return to optimal operation.

Confined space work like this demands:
- Full hazard assessment and entry planning
- Continuous air quality and gas monitoring
- Proper ventilation and rescue readiness
- Experienced personnel trained for tight-access environments

This is the kind of work where process, discipline, and attention to detail matter just as much as the cleaning itself. Another challenging job completed safely and properly.

Take a look through the photos to see the conditions and the level of work involved.

Client Spotlight: Western Mechanical Ltd

Removing wax protectant from large precision-machined components, fast, clean, and without damaging the surface.

These parts are coated for transport protection, but traditional removal means chemicals, wiping, residue, and time. It’s messy and inefficient.

With dry ice blasting:
No chemicals
No secondary waste
No moisture
No abrasion to machined surfaces
Faster turnaround

The dry ice hits, lifts the wax, and disappears, leaving a clean, dry, ready-to-use surface.

This is exactly where dry ice blasting shines, precision work that needs to stay precision.