The CM5-3 Pump from Grundfos is a powerful and ozone-compatible centrifugal pump designed specifically for ozone water systems. Whether you’re injecting ozone into water with a venturi injector or circulating ozonated water through your system, the CM5-3 delivers reliable, efficient performance backed by a robust design built to withstand the unique demands of ozone treatment.
Overview: CM5-3 Key Features
- 1.4 HP Stainless Steel Pump
- Flows up to 20 GPM at 51 PSI
- Dual Voltage Operation (120 VAC / 220 VAC)
- All Ozone-Compatible Wetted Parts
- Pump Head Rotation for Flexible Installation
- Easy Maintenance with Rebuild Kits Available
- Excellent Seal Life Even in High Ozone Conditions
Engineered for Ozone Water Applications
Unlike standard pumps, the CM5-3 is specifically designed to withstand the oxidative stress of ozone-rich environments. With stainless steel components, Viton seals, and other ozone-resistant materials, this pump is a reliable choice for long-term use in high-ozone systems.
Its centrifugal design provides the consistent flow and pressure necessary for effective ozone mixing, especially when used with a venturi injector like our Model 784.
Versatile Performance with Model 784 Venturi
For optimal ozone dissolution into water, we recommend pairing the CM5-3 with the Model 784 Venturi Injector. In this configuration, the system typically operates at 10 GPM, creating ideal conditions for ozone gas transfer.
This setup makes the CM5-3 perfect for:
- Ozone recirculation loops
- Ozone injection under city water pressure
- Compact ozone water treatment skids
Smart, Flexible Design
The CM5-3 features a top-mounted water discharge port that can be easily rotated by loosening four bolts on the pump head. This allows for quick orientation adjustments without full disassembly—ideal for tight spaces and custom layouts.
With dual voltage capability, the pump can run on either 120 VAC or 220 VAC, making installation simple and flexible across various system designs.
Proven Durability and Serviceability
In our experience, the CM5-3 pump offers exceptional longevity, especially when exposed to high ozone concentrations. It replaced the older Grundfos CHI series, and since then, has proven far superior in both ozone resistance and overall reliability.
If maintenance is ever required, rebuild kits are available, and the pump is designed to be easy to service with accessible components and straightforward repair procedures.
Pump Curve & Performance
Pump output will vary depending on system pressure and inlet conditions. At 0 PSI inlet pressure, the CM5-3 can reach a maximum pressure of 57 PSI. Depending on the application, water flow rates of up to 30 GPM are possible.
For a detailed view of flow vs. pressure, refer to the CM5 series pump performance curve. Need help choosing the right model for your setup? Our application engineers are happy to assist.
Why Choose the CM5-3?
- Built for ozone: corrosion-resistant, durable, and proven
- Ideal for venturi-based ozone injection systems
- Flexible voltage and discharge configurations
- Dependable, quiet, and low-maintenance operation
- Supported by expert technical assistance and rebuild kits
Conclusion
If you’re building or upgrading an ozone water system, the CM5-3 is a top choice for delivering high flow, high reliability, and ozone compatibility in one powerful package. Trusted by professionals and field-tested across hundreds of systems, the CM5-3 will keep your ozone water process running efficiently and effectively.
You can find this product here: https://www.oxidationtech.com/grundfos-cm5-3.html
