Zenit GRG 300 Cast Iron Grinder Pump with Multi-Channel Open Impeller & Rotary Knife (Max 320LPM/300kPa)

The Zenit GRG 300 is a high-head, industrial-grade grinder sewage pump designed to reliably process unstrained civil and industrial wastewater containing solids, fibres, and filaments. Engineered with a cast iron multi-channel open impeller and a hardened rotary knife grinding system, it delivers consistent performance where standard drainage pumps would clog or stall.

With a maximum head of 30 metres and a flow capacity of up to 320 litres per minute, the GRG 300 is ideal for long-distance pumping, high-lift applications, or installations with small-diameter discharge piping. Its heavy-duty construction, low-maintenance hydraulic design, and compatibility with hazardous environments make it the preferred choice for remote pumping stations and underground pits.

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): 3.0 kW / 4.0 HP
• Power Supply: 415 V (Three-phase, 50 Hz)
• Max Flow: 320 L/min
• Max Head: 30 m (3.0 bar / 300 kPa)
• Impeller Type: Multi-channel open impeller
• Grinder Type: Rotary knife and stationary ring in chromium steel
• Free Passage: 0 mm (due to grinder mechanism)
• Outlet Size: G 2” BSPF (DN32 or DN40 optional flange)
• Pump Body & Impeller: Cast Iron EN-GJL 250
• Shaft Material: AISI 431 Stainless Steel
• Mechanical Seals: Dual SiC (2SiC) + V-ring in oil chamber
• Ingress Protection: IP68
• Insulation Class: H
• Max Liquid Temperature: 40°C
• pH Range: 6 – 14
• Max Fluid Density: 1100 kg/m³
• Starts per Hour: Max 30
• Noise Level: <70 dB (submerged)
• Installation: Wet installation only (ZENS9024.006 ring stand compatible)
• Optional Certification: ATEX Ex d / IECEx available (model dependent)

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