Closed-system treatment and sampling — keep what BG29 cleaned, clean.
Quarterly sampling, dosing top-ups, side-stream filtration and corrosion-coupon monitoring for closed heating and chilled water systems — to BSRIA BG50 and BS8552. The follow-through that protects what your BG29 clean delivered.
Closed System Treatment & Sampling
Closed systems aren't really closed. Oxygen leaks in through air separators, pump seals and joints. Microbiology survives flushing. Inhibitor depletes. Iron and copper concentrations climb. By the time the chiller seizes or the LTHW pump packs up, the chemistry has been telling you the story for years.
Our closed-system programme reads that story quarterly and acts on it. BS8552 sampling, BG50 acceptance limits, written corrective actions for anything trending out — and side-stream filtration or magnetic separation where particulate is feeding bacteria.
This is what a real water treatment programme looks like — not a quarterly dose-and-go, but a quarterly diagnosis with a corrective action plan that closes the loop before next visit.
We're based in Birmingham, so closed-system sampling and dosing across Birmingham and the West Midlands fits easily around your maintenance windows — with the same BG50 programme delivered UK-wide.
When you need it
- You've just completed a BG29 clean and need to keep the chemistry in spec
- Your closed-system chemistry is trending outside BG50 limits — iron, total bacteria, SRB, inhibitor residual
- Pump seals, AHU coils or chillers are showing signs of corrosion or fouling
- You're running quarterly sampling that produces a number with no recommended action — just data
- You need permanent side-stream filtration designed and installed
- An insurance inspection or audit is asking for closed-system records you don't have
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.
Quarterly Sampling
BS8552-compliant samples — chemistry (iron, copper, inhibitor, sulphate, chloride, conductivity, pH) and microbiology (TVC, SRB, NRB, pseudomonas).
Dosing Programme
Inhibitor (molybdate, nitrite or tannin), biocide (slug or continuous), dispersant — designed to system chemistry and dosed during visits.
Side-Stream Filtration
Hired or permanently-installed bag filters, magnetic separators or cartridge filtration sized to the system.
Corrosion-Coupon Monitoring
Carbon-steel and copper coupons rotated quarterly with mass-loss analysis to quantify metal loss rate.
Corrective Actions
Written corrective actions for anything trending out — flushing, partial drain-downs, biocide slug doses, mechanical investigation.
Reporting & Trending
Per-visit report with sample certificates, trend chart vs BG50 limits, photographed exceptions and a 12-month trend summary.
The compliance map for closed systems.
Built around the sector's compliance picture.
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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.