Automatic Coagulation Control System for Water Treatment

Discover our coagulant dose control system

Automatic Coagulation Control from PMA uses the on-line measurements of inlet water turbidity and UV-VIS spectral analysis provided by the s::can Spectro::lyser to predict the coagulant dose required to achieve treatment aims.

Compass Coagulation Control System

Compass is a cutting-edge advanced automatic coagulation control system for water treatment, suitable for use with any metal based coagulant.

The key benefits

Our award winning coagulant dose control system can be used in drinking water treatment. It can be used with any source water type, any coagulant type and any treatment equipment.


Instant response time to any changes in conditions.


Unaffected independent process control.


Eradicates under-dosing and increases plant performance.


Eradicates overdosing and decreases operating costs.

Benefits of

using compass

Conventional Mode

  • Max Turbidity removal-all conditions
  • Very low metal residuals
  • Max removal of coagulable organics
  • Longer filter run times
  • Reduced chlorine demand

Enhanced Mode

  • Reduced sludge load
  • Reduced risk of DBP formation
  • Reduced chemical costs
  • More stable chlorine residuals

Truly advanced

Compass will automatically control the coagulant dose to achieve effluent phosphate limits by providing a predicted coagulant mass dose output (mg/L) to the plant control system. This needs to be converted to a volumetric dose using the plant flow. The coagulant dose pumps are then controlled to deliver the required volumetric coagulant dose. Alternatively, a flow signal can be taken directly into the s::can controller and the dosing system can be controlled directly by the Compass package.

Coagulant control solution from PMA Ltd.


The compass coagulant dose control system designed for turbidity removal in drinking water treatment. It provides the best measure to meet filter turbidity targets (e.g. <0.1NTU) at the lowest coagulant dose.

Compass EOR

The enhanced organics removal (EOR) system is aimed for any dissolved organics removal in drinking water treatment. It delivers the prime dose to meet filter turbidity objectives and maximise dissolved organics removal at the lowest coagulant dose.

Automatic coagulation control system designed to be fast, responsive save you an annual return on investment of up to 80%.

Immediate response to changing conditions

Reductions in chemical dosing lower coagulant costs and results in reductions in sludge disposal costs. A WWTP with a coagulant purchase and sludge disposal cost of £399,000 per year is likely to achieve in excess of 15% saving or £51,000. This gives a one-year payback for the system.

Contact us to about our advanced automatic coagulation control system.

Spare and replacement parts?

Scroll down to use our contact form to enquire about spare and replacement parts. If you do not know the part number or name for a required spare part please simply describe the spare part. Our team of expert engineers are here to help.

Here to support you, nationwide.

With field engineers strategically located throughout the UK, we have the ability to deliver an outstanding customer service solution. Our engineers are capable of undertaking a wide range of tasks that require a competent, patient, technical and experienced mind to exceed your expectations.

Requesting technical documents?

Submit your details at the bottom of this page and your request will be processed immediately by our team of engineers at PMA. For technical documents please ensure to include details about your application so that our team can deliver a bespoke document for your specific requirements.

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If you need a call back about how Process Measurement and Analysis can help you or have any questions at all please feel free to contact us at [email protected].  A member of our experienced team will contact you directly.

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