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Why ORP Systems Fail - and How to Stop it
Paperback
Technology & EngineeringGeneral Construction & Renovation
ISBN13: 9781764529631
Publisher: David Watson Pool Consulting
Published: Jul 23 2026
Pages: 278
Weight: 1.11
Height: 0.76 Width: 6.00 Depth: 9.00
Language: English
ORP controllers can overdose a pool to 30 mg/L of chlorine while showing a perfect reading. This book explains exactly why - and how to stop it happening.
Oxidation-Reduction Potential control is one of the most widely installed and least understood technologies in recreational water management. Pool professionals learn to calibrate the equipment. Very few learn how ORP actually behaves inside a real, operating water body - and what it cannot tell you.
This book changes that.
Written by a practitioner with more than forty years of field experience across domestic, commercial, and public aquatic facilities, ORP Control in Real Pools covers the full operating environment: hydraulics, turnover, filtration, carbonate chemistry, pH behaviour, temperature, cyanuric acid, salt, secondary sanitisers, probe selection, probe fouling, dosing system design, bulk chemical storage, calibration, troubleshooting, and the legal responsibilities that come with getting it wrong.
It does not treat ORP as a magic fix. It explains what ORP is actually measuring, why it responds the way it does, and where - in spas, spray pads, heavily aerated systems, and stabilised pools - it cannot be relied upon.
You will learn:
- Why ORP reads correctly while the pool is dangerously over- or under-dosed
- How pH, CO₂, cyanuric acid, and temperature each distort what the probe sees
- Why stabilising pH is the first step to stabilising ORP
- How to set up, commission, and troubleshoot ORP/pH systems in real conditions
- What the industry teaches about ORP - and where that teaching breaks down
- How to manage bulk chemical storage safely alongside automated dosing systems
- Your legal obligations when an automated system causes harm
The technical content has been reviewed for accuracy by Richard A. Falk, whose work on chlorine speciation and redox behaviour is widely cited across the industry.
This is a companion volume to Pool and Spa Leak Investigation: A Practical Guide for Trained Professionals, and is part of a series written for technicians, operators, facility managers, and regulators who work with real pools under real pressure.
ORP is not unreliable - it is conditional. This book explains the conditions.
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