ORP vs Residual Chlorine: Differences and How to Combine Them
Author: Zhejiang Weilan Technology Co., Ltd.Source: Official sitePublished: Category: Technical Articles
Summary: ORP reflects oxidizing power while chlorine reflects dosage — how to choose and combine them.
Essence
- ORP (mV): overall oxidizing power — actual disinfection "firepower"
- Chlorine (mg/L): chlorine concentration — "ammunition level"
Pros & Cons
ORP responds fast and is reagent-free but pH-sensitive; chlorine is intuitive and standard-comparable but more complex.
Recommendation
Use ORP for fast closed-loop control and chlorine for compliance data. Dual-parameter monitoring is the most robust setup — see FM-ORP200.