How grease traps work
Fat, oil and grease has a lower specific gravity than water and as a consequence it floats on it’s surface.
This principle makes a conventional grease trap extremely simple and very effective.
Typically a grease trap is a tank containing an integral baffle-wall. The wall runs from the top of the tank to just short of it’s base - effectively dividing the chamber into two compartments.
The grease trap system separates fat, oil and grease as follows
1) Kitchen effluent passes into the chamber which slows the flow and allows the oil content to separate from the water.
2) Once trapped/separated the oil content floats to the surface creating a layer of fat, oil and grease.
3) ‘Cleaned’ water is allowed to pass under the baffle wall and onto the main drainage system.
This separation principle is employed in grease-traps ranging from indoor under-counter units to large below-ground systems and automatic grease separators .
Watling Hope supply grease traps for all applications from 20 litre stainless steel under sink units to 8000 litre underground separators.
Once installed the grease trap will require regular emptying using a vacuum unit to maintain its effectiveness or regular treatment using a biological additive (see grease treatment).
Please browse our categories of grease separators using the sub-menu.
These include -
Automatic - Self-emptying grease traps
State of the art food and grease removal, no enzymes or vacuum emptying required.
Budget - Epoxy Resin Coated Mild steel grease traps
Conventional baffled traps constructed in Mild Steel for under sink installation.
Premium - Stainless Steel grease traps
Conventional baffled traps constructed in high-grade stainless steel for under sink installation.
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Water UK Guidance on Grease Traps 
