Pre-commission cleaning to BG29 — handed over clean, kept clean.
Specialist flushing, chemical cleaning and passivation of new and modified closed water systems — LTHW, CHW, MTHW, condenser water and ancillaries — delivered to BSRIA BG29/2021 with witnessed evidence and a snag-free handover.
Pre-Commission Cleaning of Closed Systems
BG29/2021 is the industry standard for getting a new or modified closed-water system clean before it's handed over. Skip it or do it badly and you bake corrosion, scale and biofilm into the system from day one — and the contractor takes the call when chillers fail or pump seals start eating themselves a year later.
We deliver every stage: dynamic flushing, chemical cleaning, passivation, biocide and final sample evidence — all witnessed, all documented, and all mapped to BG29's acceptance criteria.
Project managers like us because we close out cleanly. Building services consultants like us because the sample chemistry stands up at design-stage review. Owners like us because the system is genuinely clean — not just paperwork-clean.
Based in Birmingham, we deliver BG29 pre-commission cleaning across Birmingham and the West Midlands to construction programmes, and mobilise to projects UK-wide.
When you need it
- A new build is approaching handover and you need BG29 pre-commission cleaning
- An extension or refurb has tied new pipework into an existing system
- Sample chemistry has come back outside BG50 limits and you need investigative cleaning
- Your closed system is showing fouling, scale, biofilm or microbiological growth and needs a reset
- You're a M&E contractor wanting a specialist subcontractor with a clean handover record
- You need a side-stream filtration unit hired in for a long clean
What's included as standard.
A typical engagement covers every line below. Where your scope needs more — multi-site rollout, white-label delivery, framework KPIs — we build it on top of this baseline.
Mobilisation & RAMS
Risk assessments, method statements, COSHH, induction and pre-start documentation — all on site before we touch a valve.
Static Flush
Initial fill, vent and static flush to remove gross debris and construction contamination.
Dynamic Flush
High-velocity dynamic flushing with circulator pumps and side-stream filtration until samples meet BG29 turbidity and iron limits.
Chemical Clean
Surfactant-based degrease + acid or alkali clean as system metallurgy and contamination dictate, neutralised and rinsed.
Passivation
Inhibitor dose and circulation to passivate metal surfaces, verified by inhibitor residual chemistry.
Biocide & Sample Evidence
Bacterial control biocide dose, final BG29-compliant sampling via UKAS lab, and full BG29 evidence pack for handover.
The compliance map for pre-commission cleaning.
Built around the sector's compliance picture.
Commercial
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From brief to audit-ready evidence in five steps.
Brief & Survey
Free site walk-through with a senior engineer — scope, plant, risk, gaps.
Quote & Scheme
Itemised quote plus written scheme of control, dosing logic and reporting cadence.
Mobilise
Risk assessments, method statements, HSE paperwork and induction — turnkey.
Deliver
Engineers on-site with digital reporting, photos, lab links and live PPM tracking.
Evidence
Certificates, logbooks and HSE-ready audit packs — issued within 48 hours.