8552 “EMAUX” Digital ORP Meter

As swimming pool professionals, we emphasize the importance of monitoring ORP (Oxidation-Reduction Potential) to ensure effective sanitation and water quality. ORP is measured in millivolts (Mv) and indicates the strength of oxidizers like chlorine in the pool water.

Understanding ORP Readings in Mv

A higher ORP value means the water has a stronger ability to oxidize contaminants, ensuring better sanitation. A lower ORP value may indicate insufficient sanitizer levels or poor water quality.

Typical ORP Guidelines:

• Below 650 Mv – Insufficient sanitation (risk of bacteria and algae growth)
• 650 – 750 Mv – Optimal disinfection range for pools
• Above 750 Mv – Strong oxidation, but may indicate excessive chlorine

Converting ORP to Chlorine (PPM)

Since ORP measures the effectiveness of chlorine rather than its concentration, there isn’t a fixed direct conversion. However, approximate correlations can be made under stable Ph and water conditions:

Important Factors Affecting ORP:

• pH Level: ORP drops as pH rises. Keeping pH in the 7.2 – 7.6 range maximizes chlorine efficiency.
• Cyanuric Acid (CYA): Stabilizer reduces ORP effectiveness, meaning higher chlorine is needed to maintain the same ORP level.
• Water Contaminants: High organic load (like swimmers, debris, or oils) can lower ORP even if chlorine is present.

Why Use a Digital ORP Meter?

A Digital ORP Meter provides real-time readings, allowing for precise monitoring and quick adjustments to chlorine dosing. This ensures that the pool remains safe, clear, and well-balanced while avoiding unnecessary chemical overuse.
For accurate chlorine control, we recommend using both ORP and Free Chlorine (ppm) testing to get a complete picture of water quality. Let us help you integrate ORP monitoring into your pool system for easier, more effective maintenance!