Managing fats, oils, and grease (FOG) onboard ships is essential for protecting wastewater systems and ensuring reliable vessel operations. From cruise ships and offshore platforms to commercial vessels and superyachts, galley operations continuously generate grease that must be controlled before entering drainage and treatment systems.
If left unmanaged, FOG can lead to blocked pipework, treatment plant disruption, membrane fouling, operational downtime, and costly repairs. As a result, effective grease management is a key component of marine wastewater performance and compliance.
What Is a Marine Grease Trap?
A marine grease trap is a wastewater device installed onboard ships to separate fats, oils, and grease (FOG) from galley discharge before it enters grey water systems or wastewater treatment plants. It forms part of the vessel’s overall wastewater management system, helping to protect downstream components and maintain consistent flow performance.
How Do They Work?
Marine grease traps work by slowing wastewater flow, gravity allows for lighter grease to rise to the surface while heavier solids settle below. The separated grease is then retained within the unit and removed during scheduled pump-outs.
Why FOG Management Matters Onboard
When grease is not effectively separated or left unmanaged, it passes through the drainage system and into onboard treatment equipment. Over time, this can result in:
Membrane fouling and reduced treatment efficiency
Blocked pipework and restricted flow
Pump and valve failures
Increased tank pump-out requirements
Emergency maintenance and repair costs
Operational downtime and potential compliance issues
In most cases, preventing FOG build-up is significantly more efficient than dealing with system failures after they occur.
Traditional Grease Traps vs Automatic Grease Removal
Traditional marine grease traps are passive systems that store grease until they are manually emptied. While they separate FOG from wastewater, they rely on regular pump-outs as grease continuously builds up inside the unit.
This storage-based approach can lead to frequent maintenance, odours, hygiene concerns, and operational disruption onboard vessels.
Marine Guardian Auto-Skim
Automatic Grease Removal Devices take a different approach, removing grease continuously at source instead of storing it. Systems such as the Marine Guardian AutoSkim separate solids and automatically skim 99.7% of free-floating grease into an external container.
This reduces internal build-up, improves hygiene, and can reduce pump-outs to just 2–4 times per year depending on usage.
Effective marine grease management plays a critical role in protecting onboard wastewater systems. While traditional grease traps rely on frequent pump-outs, newer automatic grease removal systems such as Marine Guardian, focus on continuous removal and recovery at source.
This shift in approach can help reduce maintenance demands, improve system hygiene, and support more consistent wastewater performance across a wide range of vessel types.
Grease Guardian is a leader in grease management technology, offering high-performance Automatic Grease Removal Devices for a variety of sectors, including hospitality, marine, and industrial. Learn more about our innovative solutions here
Stay tuned for more updates, tips, and industry insights on our blog.
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Marine GG (Up to 20 l/s)
FLOW: 5 l/s to 20 l/s BUILD: 316 Stainless Steel Tank CAPACITY: Up to 1200 Litres FEATURES: Pro-Clean (A), Solids Transfer (IS), Show-Absorb Skid Mounts, Shut off valves, Eco-Mode EXTRAS: Oil Level Sensor, Motion-Sensor, Audio-Alarm, Aero-Flow, ST Traps WARRANTY: Up to 10 years on tank (1-3 year parts)
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MGD3 A
FLOW: 1.75 l/s BUILD: 316/16G Stainless Steel Tank CAPACITY: 55 Litres FEATURES: Top Filter-Basket (IS), Side Mounted inlet & Outlets, Seal+ lids EXTRAS: Frames.Non standard Flanges, ST Traps WARRANTY: Up to 10 years on tank (1-3 year parts)
MGT2 A
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D1
D1 Grease Guardian (0.75 l/s, 30 Litres capacity) D1 Grease Trap and Grease Removal Unit for sinks and ovens FLOW: 0.75 l/s BUILD: 304/16G Stainless Steel Tank CAPACITY: 30 Litres FEATURES: Filter-Basket, Eco-Mode EXTRAS: Frames, Audio-Alarm WARRANTY: Up to 5 years on tank (1-3 year parts)
D2
D2 Grease Guardian (1.25 l/s, 45 Litres capacity) GGD Grease Trap and Grease Removal Unit for sinks and ovens FLOW: 1.25 l/s Flow Rate BUILD: 304/16G Stainless Steel Tank CAPACITY: 45 Litres FEATURES: Filter-Basket, Eco-Mode, PLC-Smartech EXTRAS: Frames, Audio-Alarm WARRANTY: Up to 5 years on tank (1-3 year parts)
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D4
D4 Grease Guardian (2.25 l/s, 85 Litres capacity) GGD Grease Trap and Grease Removal Unit for sinks and ovens FLOW: 2.25 l/s Flow Rate BUILD: 304/16G Stainless Steel Tank CAPACITY: 85 Litres FEATURES: Filter-Basket, Eco-Mode, PLC-Smart EXTRAS: Frames, Audio-Alarm WARRANTY: Up to 5 years on tank (1-3 year parts)
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X7
X7 Combi Guardian GGX Grease Trap and Grease Removal Unit for steam oven and single bowl sink applications FLOW: 0.5 l/s BUILD: 304/16G Stainless Steel Tank CAPACITY: 25 Litres FEATURES: Pro-Clean (M), Dry-Basket, Eco-Mode EXTRAS: Frames, Pro-Clean (A), Motion-Sensor, Audio-Alarm, Aero-Flow WARRANTY: Up to 10 years on tank (1-3 year parts)
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GGXM15
GGXM15 Grease Guardian Manual Grease Trap 40 litres Grease Trap for small sink FLOW: 1 l/s BUILD: 304/16G Stainless Steel Tank CAPACITY: 40 Litres FEATURES: Side Access Filter-Basket EXTRAS: Bio-Sachets, Dosing Agents WARRANTY: 2 year
GGXM25
GGXM25 Grease Guardian Manual Grease Trap 60 litres Grease Trap for small sink FLOW: 1.58 l/s BUILD: 304/16G Stainless Steel Tank CAPACITY: 60 Litres FEATURES: Side Access Filter-Basket EXTRAS: Bio-Sachets, Dosing Agents WARRANTY: 2 year
GGXM35
GGXM35 Grease Guardian Manual Grease Trap 80 litres Grease Trap for small sink FLOW: 2.21 l/s BUILD: 304/16G Stainless Steel Tank CAPACITY: 80 Litres FEATURES: Side Access Filter-Basket EXTRAS: Bio-Sachets, Dosing Agents WARRANTY: 2 year
ST1
ST1 Sink Guardian Sink filter for 90mm plug holes FLOW: N/A BUILD: Stainless Steel Tank CAPACITY: 0.5 Litres FEATURES: Rubber plug, primary filter plug, secondary filter basket, tertiary filter EXTRAS: Low lying trap WARRANTY: Up to 1 year
ST8
ST8 Food Guardian (8 Litres) Solid Waste Filter for kitchen food waste FLOW: 0.75 L/S BUILD: 304/16G Stainless Steel Tank CAPACITY: 8 Litres FEATURES: Couplers, filter basket EXTRAS: Low outlet option, conversion kit to coffee trap WARRANTY: Up to 1 year
ST12
ST12 Food Guardian (12 Litres) Solid Waste Filter for kitchen food waste FLOW: 1.75 L/S BUILD: 304/16G Stainless Steel Tank CAPACITY: 12 Litres FEATURES: Couplers, filter basket WARRANTY: Up to 1 year
ST23
ST23 Food Guardian (23 Litres) Solid Waste Filter for kitchen food waste FLOW: 3.5 L/S BUILD: 304/16G Stainless Steel Tank CAPACITY: 23 Litres FEATURES: Couplers, filter basket WARRANTY: Up to 1 year
ST2
ST2 Coffee Guardian Coffee waste strainer for Barista Machine outflow pipe BUILD: 304/16G Stainless Steel CAPACITY: 0.6 Litres FEATURES: Basket with fine mesh strainer and pipe connections. Wall bracket. WARRANTY: Up to 1 year
ST4
ST4 Undersink Coffee Guardian Coffee Waste Filter for sink FLOW: 0.5 L/S BUILD: 304/16G Stainless Steel Tank CAPACITY: 5 Litres FEATURES: Couplers, filter basket, elbow, filter back, fine mesh sock WARRANTY: Up to 1 year
NS2 Grease Trap (2 l/s, 280 Litres capacity)
GGX Centralised Grease Trap for commercial applications FLOW: 2 l/s BUILD: 304/16G Stainless Steel Tank CAPACITY: 280 Litres FEATURES: Access chambers, inspection window, ventilation connection EXTRAS: Level Sensor, Evacuation Pump, Desludge Pipe Connection WARRANTY: Up to 2 years on tank
NS4 Grease Trap (4 l/s, 560 Litres capacity)
GGX Centralised Grease Trap for commercial applications FLOW: 4 l/s BUILD: 304/16G Stainless Steel Tank CAPACITY: 560 Litres FEATURES: Access chambers, inspection window, ventilation connection EXTRAS: Level Sensor, Evacuation Pump, Desludge Pipe Connection WARRANTY: Up to 2 years on tank
NS6 Grease Trap (6 l/s, 840 Litres capacity)
GGX Centralised Grease Trap for commercial applications FLOW: 6 l/s BUILD: 304/16G Stainless Steel Tank CAPACITY: 840 Litres FEATURES: Access chambers, inspection window, ventilation connection EXTRAS: Level Sensor, Pressure Clean, Recirculation, Evacuation Pump, Desludge Pipe Connection WARRANTY: Up to 2 years on tank
NS10 Grease Trap (10 l/s, 1400 Litres capacity)
GGX Centralised Grease Trap for commercial applications FLOW: 10 l/s BUILD: 304/16G Stainless Steel Tank CAPACITY: 1400 Litres FEATURES: Access chambers, inspection window, ventilation connection EXTRAS: Level Sensor, Pressure Clean, Recirculation, Evacuation Pump, Desludge Pipe Connection WARRANTY: Up to 2 years on tank
NS15 Grease Trap (15 l/s, 2100 Litres capacity)
GGX Centralised Grease Trap for commercial applications FLOW: 15 l/s BUILD: 304/16G Stainless Steel Tank CAPACITY: 2100 Litres FEATURES: Access chambers, inspection window, ventilation connection EXTRAS: Level Sensor, Pressure Clean, Recirculation, Evacuation Pump, Desludge Pipe Connection WARRANTY: Up to 2 years on tank
NS 15A Grease Trap (15 l/s, 2100 Litres capacity)
GGX Centralised Grease Trap for commercial applications FLOW: 15 l/s BUILD: 304/16G Stainless Steel Tank CAPACITY: 2100 Litres FEATURES: Access chambers, inspection window, ventilation connection EXTRAS: Level Sensor, Pressure Clean, Recirculation, Evacuation Pump, Desludge Pipe Connection WARRANTY: Up to 2 years on tank
NS 10A Grease Trap (10 l/s, 1400 Litres capacity)
GGX Centralised Grease Trap for commercial applications FLOW: 10 l/s BUILD: 304/16G Stainless Steel Tank CAPACITY: 1400 Litres FEATURES: Access chambers, inspection window, ventilation connection EXTRAS: Level Sensor, Pressure Clean, Recirculation, Evacuation Pump, Desludge Pipe Connection WARRANTY: Up to 2 years on tank
NS 6A Grease Trap (6 l/s, 840 Litres capacity)
GGX Centralised Grease Trap for commercial applications FLOW: 6 l/s BUILD: 304/16G Stainless Steel Tank CAPACITY: 840 Litres FEATURES: Access chambers, inspection window, ventilation connection EXTRAS: Level Sensor, Pressure Clean, Recirculation, Evacuation Pump, Desludge Pipe Connection WARRANTY: Up to 2 years on tank
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