Chlorine Dioxide

Today, applications for Chlorine Dioxide are as diverse as the destruction of hydrogen sulphide in gas pipelines, through to the purification of water in commercial buildings, critical care areas in hospitals, food processing plants and industrial cooling water systems.

Whatever the size or complexity of your application, PH Water Technologies has a Chlorine Dioxide system to suit – ranging from small borehole treatment systems, through to custom engineered generation systems used in data centres and industrial iron and manganese precipitation applications.

Whatever the application PH Water Technologies are sure to deliver effective Chlorine Dioxide dosing and control for your peace of mind.

What is Chlorine Dioxide? 

Chlorine dioxide is an oxidising biocide/disinfectant that when used correctly, has been shown to be effective at controlling both legionella and biofilm growth in hot and cold water systems.

In the appropriate application, it may be used to aid legionella control where maintaining a conventional temperature regime is difficult or where the removal of all dead legs and little used outlets is impractical.

Chlorine dioxide is usually produced on site from a chlorite-based precursor using a chlorine dioxide generator or dosing system by reaction with one or more other chemical precursors or by a catalytic oxidation process.

Why is it used? 

It has a bacterial efficiency comparable with that of free chlorine in the neutral pH range, however unlike chlorine, its efficiency increases as the pH rises. Another important fact is that it is extremely soluble in water, being up to five times more soluble than chlorine.

Used commercially in aqueous solution rather than gas due to its explosiveness when exposed to rising temperatures, exposure to light or allowed to come into contact with organic substances. In aqueous solution it is completely harmless and will not react chemically with water, as would chlorine. It can be used up to a maximum dose level of 0.5ppm for drinking water disinfection, and has a particular advantage where phenol’s are likely to cause taste problems or in waters which have high pH or ammonia levels.


  • Flow rate upto 15m3/h with 1ppm ClO2 dose
  • Touchscreen Controller
  • 1 x ClO2 sensor, potentiostatic with upto 6 bar back pressure allowance.
  • 1 x analogue output 4-20mA, residual Clo2 level.
  • 2 x VFC, general fault and low chemical
  • Precursor Chemical Leak Detection
  • In Line ClO2 Generator 2” uPVC with 6mm NRV terminations, PTFE tubing
  • Digital solenoid dosing pumps
  • Power: 230VAC, 50Hz, single Phase

1 ½” Multi-jet water meter

  • 1 ½” BSP connections

K=1 output

SM50/3 – 2” uPVC Static Mixer

Mechanical mixing of incoming mains water with the dosed chlorine dioxide. This allows good dissolution of the chemical and reduces the ClO2 level hysteresis in the water.

ClO2 Gas escape alarm

  • Automatic shut off of dosing plant
  • BMS Output

Gas escape Red LED flashing beacon with ‘Gas Escape’ Signage.

12 V DC LED beacon mounted on warning sign for installation outside ClO2 generator room. Linked to unit and will flash if gas escape alarm is activated allowing instruction of PPE to be worn prior to entering room.

Cloud Connect

  • Online access to the clo2 system, monitoring, errors, and reporting.

Includes 1 year’s sim card contract

Clo2 Process schematic with Static Mixer and sample after tank. Generic 1