Grundfos CM3-5 Horizontal Multistage Pump

The Grundfos CM3-5 is a compact horizontal multistage centrifugal pump designed for light-duty water supply, pressure boosting, and liquid transfer applications where installation space is constrained and single-phase or three-phase power supplies are available. The CM3-5 A-R-I-E-AQQE configuration covers 3 m³/h nominal flow at approximately 68 m head through five stainless steel stages, with the AQQE designation indicating a stainless steel outer sleeve, PTFE/rubber O-ring sealing, and a ceramic/EPDM mechanical seal — a material combination well suited to mildly brackish or chemically treated water common in Saudi Arabia's reverse osmosis product water distribution systems, where residual chlorine and pH adjustment chemicals are present in treated water streams.

The CM range's horizontal orientation provides a low installation profile suitable for mounting on walls or inside compact pump enclosures, and the base plate mounting holes are standardised for direct replacement of existing single-stage booster pump installations — a key advantage in Saudi Arabia's large residential compound and commercial building retrofit market where equipment rooms are already built and available floor space is fixed. The pump shaft is supported by a stainless steel radial bearing on the pump end and motor bearing on the drive end, eliminating the need for external bearing housings and making the CM3-5 one of the most maintenance-friendly options in its class, with a total of three serviceable parts: mechanical seal, impeller, and bearing — all replaceable without special tools.

In Saudi Arabia, the Grundfos CM range is widely used in single-family residential and small commercial building pressurisation duties, serving the large market of private villas and compounds in Riyadh, Jeddah, Dammam, and secondary cities where municipal water pressure is insufficient for upper floors. The CM3-5 is also extensively deployed in reverse osmosis drinking water system pressure duty for small-to-medium industrial RO skids and commercial RO water dispensers — a rapidly growing market in Saudi Arabia as industrial users and commercial facilities seek alternatives to delivered bottled water. In agricultural applications, the CM3-5 handles localised drip irrigation pressurisation duties in enclosed greenhouses and polytunnels, where its compact footprint, low noise, and single-phase availability make it suitable for installation in agricultural support buildings.

Razz Middle East stocks the Grundfos CM3-5 and the wider CM range across our Saudi distribution network, supporting same-day availability in Riyadh, Jeddah, and Dammam for urgent maintenance requirements. We offer a complete range of CM spare parts including seal kits, impeller sets, and replacement motors, ensuring a fast and cost-effective repair path for the large installed base of CM pumps operating across Saudi Arabia's residential, commercial, and agricultural sectors.