About Ekster & Associates
Ekster & Associates specializes in process optimization and automation for wastewater treatment facilities. Their flagship software, SRTmaster™, uses real-time sensor data and proprietary control algorithms to regulate sludge retention time (SRT) in activated sludge systems. This ensures stable microbial environments and improved sludge thickening.
Their solutions help treatment plants:
Maximize treatment performance
Reduce energy use by up to 60% and chemical use by up to 50%
Improve sludge settleability and reduce foaming
Streamline operations with automated, fault-tolerant control
Ekster also offers consulting and hands-on optimization services that frequently uncover significant cost savings—ranging from tens of thousands in annual energy reductions to rapid payback opportunities on process upgrades. Many of their services are designed to achieve ROI in 1 to 5 years and may qualify for subsidized funding to support implementation.
Founded in 1997, Ekster & Associates has a strong record of success with installations at major municipal treatment plants across North America. Their work has earned industry recognition, including innovation awards, and continues to advance the performance and sustainability of wastewater treatment systems.
Product Families

Wastewater DO & SRT Energy Optimization System

Water Quality Energy Optimization System

Wastewater Operation Optimization System

Sludge Blanket Optimization System
Applications & Solutions
Wastewater
- SRTMaster - Wastewater DO & SRT Energy Optimization System
- DOMaster - Water Quality Energy Optimization System
- OptiMaster - Wastewater Operation Optimization System
- BlanketMaster - Sludge Blanket Optimization System