A common question before booking a Calgary sprinkler blowout: how does the technician know when all the water is out? The answer lies in the number of compressed-air passes per zone and what the technician observes at the end of each pass. J.G. Irrigation explains the process and why professional blowouts are safer than DIY attempts.
Professional Calgary Blowout Process — Zone Pass Guide
| Pass | What Comes Out | Technician Action |
|---|---|---|
| Pass 1 (bulk water) | Large volume of water — heads spray full streams | Hold compressor for 20-45 seconds per zone until head output becomes mist/steam |
| Pass 2 (residual water) | Mist/steam — remaining water trapped in fittings | Second pass removes water pooled in low points and fittings |
| Pass 3 (final check) | Only dry air exits — no visible mist | Confirms zone is fully cleared — no water remains |
| Between each zone | Compressor tank recharges to operating pressure | Compressor must not run below 50 PSI — heads can be damaged |
Why DIY Blowouts Are Risky in Calgary
Renting a compressor and attempting a self-blowout carries significant risk: most rental compressors (small 20-30 gallon models) do not have sufficient CFM to adequately clear zone pipes — they have the pressure but not the volume of air needed. This leaves residual water that freezes. Professional compressors used by J.G. Irrigation are truck-mounted 185 CFM diesel units — far beyond what a rental can achieve. Call 587-433-4795 for your professional Calgary blowout.
Professional Calgary Blowout — Commercial-Grade Compressor, 3 Passes Per Zone
J.G. Irrigation — Calgary Irrigation Services
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