Zenit GRG 400 Cast Iron Grinder Pump with Multi-Channel Open Impeller & Rotary Knife (Max 290LPM/340kPa)

The Zenit GRG 400 is a premium-grade industrial grinder pump designed to transfer sewage and heavily contaminated wastewater under high pressure through long or narrow pipelines. Equipped with a rotary knife grinding system and a multi-channel open impeller, it effectively macerates solids, fibres, and filaments before pumping — ensuring clog-free operation and reliable performance in critical installations.

Delivering a maximum head of 34 metres and a flow rate of 290 litres per minute, the GRG 400 is ideal for civil infrastructure, remote sewage pits, industrial drainage applications, and wastewater treatment systems requiring robust solids handling and high lift capacity.

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 340 kPa (34 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): 4.0 kW / 5.5 HP
• Power Supply: 415 V (Three-phase, 50 Hz)
• Max Flow: 290 L/min
• Max Head: 34 m (3.4 bar / 340 kPa)
• Impeller Type: Multi-channel open impeller
• Grinder System: Rotary knife and stationary ring (Chromium steel)
• Free Passage: 0 mm
• Discharge Port: G 2” BSPF (DN32 or DN40 optional flange)
• Pump Body & Impeller: Cast Iron EN-GJL 250
• Shaft: AISI 431 Stainless Steel
• Seals: Dual silicon carbide (2SiC) + V-ring in inspectable oil chamber
• Insulation Class: H
• Protection Rating: IP68
• Max Liquid Temp: 40°C
• pH Range: 6 – 14
• Max Fluid Density: 1100 kg/m³
• Starts per Hour: Max 30
• Noise Level: <70 dB
• Installation: Wet only – Compatible with ZENS9024.006 Ring Stand
• 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