The CSTER range: the latest addition to P&W’s cutting-edge Soneco portfolio.

The Continuously Stirred Tank Electrochemical Reactor (CSTER) range is suitable for a wide range of water and wastewater treatment applications. Suitable for a higher volume of total solids, the reactor can pre-seed wastewater prior to treatment, keeping required dose rates low, while treatment remains effective and efficient.

The CSTER range can also be used to increase sludge density and further decrease sludge volumes whilst operating with gravity-fed flows.


  • Simple, robust continuously stirred reactor with central flocculation zone
  • Feed-water is pre-seeded prior to treatment
  • Adaptive control with remote access & operation
  • Treatment using ‘clean’ electrons
  • Continuous, chemical-free CIP (Cleaning In Place)
  • Operates by gravity displacement
  • Predictive maintenance: low man-power requirement
  • Options for pH, ORP and Zeta-potential based coagulation and flocculation
  • Wide ranging applications and installation configurations