Why Your Graf Treatment Plant Needs Professional Servicing

Graf sewage treatment plants — including the highly regarded Graf Klaro and Graf One2Clean ranges — are designed to deliver excellent wastewater treatment with low energy use and reliable performance. However, even the best systems require routine professional servicing to remain safe, compliant, and efficient.

Over time, treatment plants naturally accumulate sludge and can suffer from wear to air blowers, diffusers, valves, and control systems. If these issues are ignored, performance drops and you may start to experience odours, alarms, poor effluent quality, blockages, or total system failure. In addition to the inconvenience, poor treatment can lead to non-compliant discharge and potential enforcement action under the 2020 General Binding Rules.

Clearmasters provide full servicing for all Graf models, following manufacturer guidelines and Environment Agency standards. Our engineers check every critical component, confirm proper biological treatment is taking place, and provide a clear service record for your compliance files.

Benefits of Servicing Your Graf System

  • Protects Compliance – Maintains safe discharge quality and avoids pollution risks.
  • Prevents Breakdowns – Early fault detection avoids major repair costs.
  • Improves Treatment Efficiency – Keeps bacteria healthy and aeration balanced.
  • Extends System Lifespan – Protects key mechanical and electrical parts.
  • Reduces Running Costs – Efficient plants use less energy and need fewer call-outs.

With over 30 years of wastewater experience across the South East, Clearmasters are trusted Graf servicing specialists for domestic and commercial sites.

Do You Need Graf Treatment Plant Servicing?

Your Graf Klaro or One2Clean system should be serviced regularly, and there are also warning signs that servicing is required sooner than planned.

  • High water levels in the tank or chambers.
  • Noisy or constantly running blower suggesting worn parts or blocked aeration lines.
  • Alarm activation or warning lights on the control panel.
  • Odours around the tank, vents, or discharge area.
  • Slow drains or backing up within the property.
  • Surface scum, sludge build-up or cloudy effluent from the outlet.

If you notice any of these issues, Clearmasters can attend quickly, diagnose the cause, and restore full system performance.

Keeping Your Graf System Healthy Between Services

While professional servicing is essential, there are simple steps homeowners and site managers can take to help keep a Graf Klaro or Graf One2Clean system running smoothly between visits. These small checks help maintain biological balance, reduce stress on mechanical parts, and prevent avoidable faults.

Basic Care Tips

  • Avoid chemical overuse – Excess bleach, disinfectants, or harsh cleaners can disrupt the biological process inside your plant.
  • Never allow surface water into the tank – Roof gutters and ground drainage must not flow into the treatment plant, as this can overwhelm the system.
  • Keep the blower housing ventilated – Ensure vents around the air blower are clear to prevent overheating and premature failure.
  • Listen for unusual noises – Rattling, vibrations or silence from the blower may indicate early issues.
  • Check for odours – A healthy Graf system should produce little to no smell; odour can signal aeration problems.
  • Ensure lids and covers stay secure – Prevents debris entry, water infiltration and maintains safe access.

When to Call an Engineer

If you notice persistent odours, high water levels, blower alarms, or cloudy effluent, it’s important to get the system checked quickly. Early intervention prevents major breakdowns and keeps your plant compliant.

Clearmasters offer fast response times and expert support across the South East, ensuring your Graf system remains reliable, safe, and fully compliant all year round.

Graf Klaro vs Graf One2Clean — What’s the Difference?

Graf manufacture two of the UK’s most trusted sewage treatment systems, each with slightly different servicing requirements. Knowing your model helps ensure the correct maintenance approach.

Graf Klaro

  • Multi-chamber biological treatment system.
  • Relies on steady aeration and diffuser performance.
  • More moving parts, meaning a more detailed mechanical and air-system service.

Graf One2Clean

  • Single-tank, single-chamber treatment system.
  • Extremely low energy consumption and simple operation.
  • Fewer mechanical parts, but still needs annual aeration, sludge and compliance checks.

Whatever model you have, Clearmasters follow Graf guidance and Environment Agency standards to keep your system working exactly as designed.

What’s Included in a Graf Sewage Treatment Plant Service?

Every service follows Graf’s manufacturer checklist and UK compliance requirements:

Performance Check

We assess blower output, aeration balance, and biological treatment performance to confirm the plant is working efficiently.

Blower & Air System Inspection

Inspection of air pumps, filters, valves, pipework, diffusers and seals, replacing worn parts where needed.

Sludge Level Measurement

We measure sludge depth to confirm whether desludging is required to maintain correct biological treatment.

Effluent Quality Check

Visual and operational checks confirm the final discharge meets expected clarity and standards.

Electrical & Control Panel Test

We test alarms, timers, and electrical safety to ensure reliable operation and early fault detection.

Service Record & Certification

You receive a full service report with findings, recommendations, and compliance documentation.

Our engineers will talk you through the results in plain English and advise on any maintenance or repairs needed.

Graf Sewage Treatment Plant Servicing in action

Why Choose Clearmasters
for Graf Treatment Plant Servicing?

Trusted wastewater specialists across the South East

Clearmasters have been servicing sewage treatment plants for over 30 years, including the full Graf Klaro and One2Clean range. We understand how Graf systems are designed to perform and how to keep them operating at peak efficiency.

Our engineers carry specialist testing equipment and manufacturer-approved parts, allowing us to resolve issues quickly and prevent repeat faults. We provide clear service records that support property sales, insurance claims, and Environment Agency compliance.

From single domestic systems to larger commercial installations, you’ll receive honest advice, competitive pricing, and a friendly professional service every time.

How Often Should a Graf Treatment Plant Be Serviced?

Most Graf systems require one professional service every 12 months to remain compliant and efficient. For commercial premises or properties with higher daily flow, Graf plants may need more frequent servicing to keep the biological process stable.

  • Domestic properties – annual servicing recommended.
  • Holiday lets or multi-occupancy homes – annual service, with mid-year checks if usage is heavy.
  • Commercial or high-flow sites – servicing every 6 months, or as required by permit.

If you’re unsure what schedule is right for your Graf system, Clearmasters can assess your installation and set up a tailored maintenance plan.

Frequently Asked Questions

How often should my Graf treatment plant be serviced?

Graf recommends annual servicing for domestic properties. Commercial or high-load systems may require servicing every 6 months.

Do Graf One2Clean systems still need servicing?

Yes. One2Clean models have fewer mechanical parts, but still require annual aeration checks, sludge measurement, and compliance testing.

Why is my Graf blower running constantly?

This usually indicates worn diaphragms, blocked air lines, failing diffusers, or excessive sludge. A service identifies and fixes the cause.

My Graf system smells — what does that mean?

Odours typically indicate poor aeration, biological imbalance, or sludge overload. Servicing restores correct treatment conditions.

Can you service older Graf Klaro systems?

Yes. We service all generations of Graf Klaro and One2Clean systems, including older or discontinued models.

Do you offer emergency call-outs for Graf faults?

Yes. We provide 24/7 emergency response for alarms, blower failures, high levels, or system shutdowns.