Water Treatment Biocides: Oxidizing vs Non-Oxidizing
Water treatment biocides split into oxidizing (chlorine donors like TCCA/SDIC) and non-oxidizing (isothiazolinones, THPS, glutaraldehyde, quaternary ammonium). Best practice alternates the two to control biofilm and prevent resistance.
Oxidizing vs non-oxidizing
- Oxidizing: TCCA, SDIC — fast, cheap residual control.
- Non-oxidizing: isothiazolinones (CMIT/MIT), DBNPA, THPS, glutaraldehyde, BKC — penetrate biofilm.
How to use
Maintain an oxidizing residual and periodically shock with a non-oxidizing biocide; alternate non-oxidizers to avoid resistance. Used in cooling water, oilfield and RO.
Frequently asked questions
What is the difference between oxidizing and non-oxidizing biocides?
Oxidizing biocides (TCCA, SDIC) chemically oxidize cells for fast residual control; non-oxidizing biocides (isothiazolinones, THPS, glutaraldehyde) penetrate and break down biofilm.
Which biocide is best for cooling water?
Alternate an oxidizing biocide (TCCA/SDIC) with a non-oxidizing one (isothiazolinones, THPS) to control biofilm and prevent resistance.
About the manufacturer
VCYCLETECH is a China-based manufacturer of water treatment chemicals — antiscalants, scale & corrosion inhibitors, coagulants, flocculants, biocides, dispersants and paper chemicals — ISO 9001 / 14001 / 45001 certified, with a COA on every batch and OEM/ODM service. See our quality & certifications.
Related: Cooling water · All biocides · THPS · Isothiazolinones