Zenit GRG 250 Cast Iron Grinder Pump with Multi-Channel Open Impeller & Rotary Knife (Max 320LPM/280kPa)

The Zenit GRG 250 is a powerful and highly reliable grinder sewage pump, purpose-built for the efficient handling of civil, agricultural, and industrial wastewater containing fibres, filaments, and solids. Featuring a cast iron multi-channel open impeller paired with a high-torque rotary cutter knife, the GRG 250 ensures effective solids reduction and clog-free performance — even in narrow-diameter pipelines.

With a maximum flow of 320 litres per minute and a total dynamic head of 28 metres, this pump is ideal for high-pressure sewage transfer and long-distance discharge applications. Its robust construction and advanced hydraulic design make it especially suited for pumping from remote pits or underground installations, where conventional pumps may fail.

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 280 kPa (28 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): 2.5 kW / 3.4 HP
• Power Supply: 415 V (Three-phase, 50 Hz)
• Max Flow: 320 L/min
• Max Head: 28 m (2.8 bar / 280 kPa)
• Impeller Type: Multi-channel open impeller
• Grinder System: Rotary knife and stationary ring (Chromium steel)
• Free Passage: 0 mm (grinding system)
• Outlet Size: G 2” BSPF (DN32 or DN40 optional)
• Pump Body & Impeller: Cast Iron EN-GJL 250
• Shaft Material: AISI 431 Stainless Steel
• Mechanical Seals: Dual Silicon Carbide (2SiC) in inspectable oil chamber
• Insulation Class: H
• Ingress Protection: IP68
• Max Liquid Temperature: 40°C
• Fluid Density: Up to 1100 kg/m³
• pH Range: 6 – 14
• Starts per Hour: Max 30
• Noise Level: <70 dB
• Mounting: Wet installation (requires optional ring stand or auto-coupling base)
• Certification: (Optional ATEX or IECEx depending on model variant)

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