Oxidation Reduction Potential (ORP) is an important method for testing water quality, providing an easy way to understand sanitation levels and cleanliness of water applications.

What is ORP?

ORP measures the water’s ability to accept or release electrons and is typically used to determine the oxidising or reducing potential of a water sample, indicating possible contamination. The more positive the ORP value, the greater the tendency the water has to oxidise organisms or other material in the water, therefore killing or destroying them.

ORP measurement is integral to water quality because it indicates how sanitized or contaminated water is.  ORP is used for drinking water, swimming pools, spas, cooling tower disinfection, groundwater remediation, bleaching, cyanide destruction, chrome reductions, metal etching, fruit and vegetable disinfection and dechlorination.

ORP monitoring

ORP monitoring is widely used within the water treatment and food processing industries to ensure that water is free of contaminants and safe to recycle or consume. In order to be safe to consume, recycle, or come in contact with our skin, water is treated with a sanitising agent to have a higher oxidation potential, which then produces a higher ORP reading.  Understanding ORP values helps to determine water quality, allowing operators to decide what treatment processes are required.  Excess chlorine in wastewater effluent will result in a large positive value of ORP and the presence of hydrogen sulfide will result in a large negative value.

ATi offers the latest analytical sensor technology to provide reliability, accuracy, versatility and durability in ORP measurement solutions.

Contact us

Our team of experts are on hand to deal with any queries regarding our products or services.

Get in touch

A team of experts, ready to help

A global company with a caring culture. We have a team of experts on hand to help with any product or support query you may have. Contact us and experience ATi’s exemplary customer support.

Get in touch


Catch up on the latest from ATi

Case Study icon
Case Study
Improving pH control & compliance in effluents

The Royal Mint has an established reputation as the manufacturer of coins and blanks…

Case Study icon
Case Study
Analysing & evaluating service reservoir performance

Service reservoir performance analysis requires accurate and reliable monitoring, detailed understanding…

Editorial icon
Monitor water quality with KIWA approved technology

Drinking water quality is of key importance to public health and the provision of safe drinking water has been recognised…