Zenit GRG 750 Cast Iron Grinder Pump with Multi-Channel Open Impeller & Rotary Knife (Max 500LPM/460kPa)

The Zenit GRG 750 is a high-powered industrial grinder pump engineered for the most demanding sewage and wastewater applications. Featuring a rugged multi-channel open impeller and a hardened rotary knife cutting system, this pump offers superior solids reduction and clog-free performance in installations with narrow pipework, high lift, or long discharge distances.

With a maximum flow rate of 500 litres per minute and a head of up to 46 metres (460 kPa), the GRG 750 is ideal for use in remote pits, municipal pump stations, industrial wastewater systems, and hazardous environments where aggressive waste and high pressure converge.

FEATURES

• Integrated Rotary Knife Grinder System – Chromium steel blades grind solids before reaching the impeller
• Multi-Channel Open Impeller – Robust cast iron design ensures efficient hydraulic performance
• High Head Capability – Delivers up to 460 kPa (46 m) of head, ideal for long pumping lines
• Heavy-Duty Cast Iron Construction – Built to last with EN-GJL 250 cast iron body and impeller
• Dual Mechanical Seals – Silicon carbide (2SiC) seals in an oil chamber for long life and reliability
• Stainless Steel Shaft – AISI 431 shaft with tapered coupling ensures strength and corrosion resistance
• Anti-Clogging Design – Efficient solids expulsion and reduced impeller fouling
• Wet Installation – Suitable for fixed or portable sump setups (base plate sold separately)

SPECIFICATIONS

• Brand: Zenit Pumps
• Series: Grey – GRG
• Product Type: Submersible Grinder Sewage Pump
• Rated Power (P2): 7.5 kW / 10 HP
• Power Supply: 415 V (Three-phase, 50 Hz)
• Max Flow: 500 L/min
• Max Head: 46 m (4.6 bar / 460 kPa)
• Impeller Type: Multi-channel open impeller
• Grinder System: Rotary knife + counter-ring (Chromium steel)
• Free Passage: 0 mm
• Outlet Size: G 2" BSPF (DN32 or DN40 optional flange)
• Pump Body & Impeller: Cast Iron EN-GJL 250
• Shaft: AISI 431 Stainless Steel
• Seals: Dual mechanical seals in Silicon Carbide (2SiC) + V-ring
• Insulation Class: H
• Ingress Protection: IP68
• Max Liquid Temp: 40°C
• pH Range: 6 – 14
• Max Fluid Density: 1100 kg/m³
• Max Starts per Hour: 30
• Noise Level: <70 dB
• Installation: Wet only (compatible with Zenit ring stand ZENS9024.006)
• Certification: Optional ATEX Ex d / IECEx configurations available

APPLICATIONS

• Remote or underground sewage pits
• Civil and municipal wastewater lift stations
• Agricultural and livestock effluent pumping
• Sludge handling in industrial plants
• Pumping into narrow or high-lift discharge pipes
• Areas with high fibre or solid content in sewage