Sprinkler Winterization vs Blowout Calgary — What the Terms Mean and What Is Required

Calgary homeowners searching for “sprinkler winterization Calgary” and “sprinkler blowout Calgary” are usually looking for the same service — fall purging of the irrigation system before freeze-up. But the terms mean slightly different things. This guide explains the difference, what each involves, and exactly what a Calgary irrigation system requires before winter.

What Is Sprinkler Blowout?

Sprinkler blowout is the process of forcing compressed air through every zone of an irrigation system to purge water from lateral lines, heads, and fittings before freezing temperatures arrive. A professional blowout requires a minimum 185 CFM (cubic feet per minute) compressor — the Irrigation Association’s residential standard. The technician connects the compressor at the backflow preventer and runs two to three 20-to-30-second purge cycles per zone until no visible water exits the heads.

What Is Sprinkler Winterization?

Sprinkler winterization is a broader term encompassing the complete set of steps to prepare an irrigation system for winter, of which the blowout is the most critical. A complete winterization also includes:

• Backflow preventer drain: Manually turning the test cocks on the RPZ assembly to the 45-degree open position to drain the brass body.
• Main irrigation shutoff closure: Turning the main supply valve to the fully OFF position.
• Controller programming adjustment: Setting the controller to OFF mode (not RAIN DELAY).
• Physical component inspection: Noting any heads, valve boxes, or backflow preventer components that need spring attention.
• Written service receipt: Documenting that the service was performed correctly.

What Calgary Irrigation Systems Do NOT Need for Winterization

• Head removal: Calgary irrigation heads are installed at grade level and remain in place year-round. The blowout process clears them adequately.
• Antifreeze treatment: Glycol or antifreeze is never used in Calgary residential irrigation systems — it is incompatible with the potable water supply backflow prevention requirement.

In most Calgary irrigation service contexts, “blowout” and “winterization” are used interchangeably. J.G. Irrigation performs complete winterization on every service visit: blowout, backflow drain, shutoff closure, controller shutdown, and written receipt. Call 587-433-4795 or visit our winterization service page.