Residual Control System (RCS)

Automated Residual Control

The PAX Residual Control System (RCS) is a smart and automated disinfectant residual boosting system that gives water operators the ability to set and precisely control disinfectant residual levels in water storage tanks and key locations in the water distribution system.

Get a Quote
Residual Control System Logo

How It Works

Hover over hotspots to learn more

1 2 3 4 5 6
The PAX Water Mixer continuously blends residual throughout the entire volume to enable rapid homogenization and maximum water quality stability.
The Water Quality Station uses an advanced set of sensors to continuously measure water chemistry inside the tank.
The Smart Controller analyzes data from the Water Quality Station and sends commands to the Chemical Feed System to maintain the set-point established by the operator.
The chemical feed system precisely doses disinfectant chemicals into the tank. The system features a separate skid for the chlorine and ammonia feeds or just a chlorine skid for chlorinated systems.
The Remote Monitoring System provides real-time access to water quality data and the Smart Controller and sends automated alerts and alarms.
The Smart Controller sends water quality data to SCADA

Chlorinated Systems

RCS helps chlorinated systems maintain target residual levels while minimizing disinfection by-product formation

Chloraminated Systems

RCS helps chloraminated systems maintain target residual levels while eliminating nitrification

RCS Components


PAX Water Mixer

The PAX Water Mixer is at the heart of the Residual Control System. Only a powerful active mixer can thoroughly blend disinfectant chemicals and ensure a representative water quality sample.


Water Quality Station

The Water Quality Station (WQS) continuously monitors water chemistry. The WQS monitors residual level and provides real-time data. In chloraminated systems, the WQS knows precisely where your water chemistry falls on the chloramination curve.

PAX Smart Controller

Smart Controller

The Smart Controller is the brain of RCS. It maintains the operator-set residual level by continuously analyzing water quality data and sending commands to dose chemicals. The Smart Controller sends alerts to the operator when there is a sudden change in water quality.

PAX Chemical Feed System

Chemical Feed System

The Chemical Feed System automatically and precisely doses chemicals into the volume of water to maintain the chlorine or chloramine set-point. The system can utilize a variety of chemical sources, including liquid, gaseous or onsite generated chlorine and liquid ammonia.

Request Quote