Concrete Wash System

Green1 Technologies have developed a fully automated system to deal with high pH levels in concrete wash from work carried out on construction sites.  This system is economical, reliable and uses telemetry to monitor and record live updates to maintain pH levels and turbidity on site. Depending on the system size it can be fully solar powered with 12volt DC battery or run on a normal power supply.


We use SCADA systems to provide monitoring and control to prevent environmental harm and provide an effective concrete wash solution.


Concrete wash water is caustic and usually has a high pH value ranging between 11 and 13 on a scale that runs from 1 (very acidic) to 14 (highly alkaline), making it extremely corrosive. It contains dissolved solids including sulphates and hydroxides from cement, oil and grease from equipment used on site. It takes 1,000,000L of water to dilute 1L of concrete wash.

Concrete wash water is highly toxic to fish and other aquatic wildlife, it can cause damage to vegetation and ecosystems and with prolonged skin contact is capable of causing second degree burns. Sometimes, people refer to concrete wash water as the “silent polluter” with such major environmental impacts.


GREEN1’s concrete wash system unit has been designed to give full control to the user and it allows easy integration of pH monitoring.  The unit has a magnetic flow meter on the concrete wash water inlet to detect the flow. A dosing pump uses Polyaluminium Chloride (PAC) to separate the coarse concrete particles and allow them to settle in the filtration tank which has a lamella clarifier segregating solids from liquid which streams to the buffer tank. This process is monitored through an automatic pH controller. The pH monitoring smart system measures pH in the filtration tank and if the pH level rises above 11, it signals the pump to divert the water in the buffer tank and alerts an operator through text message. The pH limit can be adjusted as per requirement. The buffer tank has another pH monitoring system that updates the operator with live data information. Supplementary pH adjustment occurs in the buffer tank neutralizing the pH.

Green 1 Telemetry

found @ green1telemetry.nz 


The Concrete Wash Unit uses telemetry/SCADA to send data to our website & mobile phone application so that you can receive real-time information and can modify settings remotely, from anywhere in the world. Alerts can be sent by text message if sudden events occur that trigger preset levels.

Eases manpower through automation

Reduces chemical usage for an eco-friendly environment

Affordable with low maintenance cost

Highly accurate and easy data management system

Telemetry provides live data updates accessible anywhere

Can be customised as per requirement

Webcam compatible

Webpage & internet control

Weather station connection

Text alerts

Water meter

    get on google play