Grease trap problems: cleaning, capacity or drainage repair?

Describe the operational failure, not just the unit name

Tell the contractor which sinks or appliances are backing up, whether the trap is overflowing and whether other drains remain usable. A unit that appears full is not enough to identify the failed flow path. The type and model, recent cleaning record and timing of the problem help establish what needs inspecting.

Do not continue discharging hot wastewater to see whether it clears. Keep staff away from contaminated overflow and wet electrical equipment. The site manager needs to decide which facilities remain safely usable while the affected route is assessed. A plumber clearing one connection does not by itself authorise the kitchen to resume every activity.

The trap and downstream drain are connected but distinct

Grease-management equipment separates material from the wastewater passing through it, while the connected drain still needs a clear route. A restriction beyond the unit can cause water to back up even when attention has recently been given to the trap. Conversely, a local accumulation can limit flow without proving that the whole drain is damaged.

ACO publishes installation and maintenance information for specific grease-trap arrangements. The attending contractor should identify the installed unit and relevant access before opening it. This fault visit should answer where flow is being restricted and what work will restore it; longer-term equipment selection and maintenance planning are separate decisions once the immediate findings are known.

Prepare safe access to the affected equipment

Provide the unit location, available working space and the person authorised to stop connected fixtures. Equipment below sinks or within a service area may be difficult to reach while the kitchen is operating. Agree a safe working zone and any handling arrangements rather than expecting a contractor to open a cover beside active food preparation.

Do not remove heavy lids, enter a chamber or reach into retained waste yourself. The contents and condition can introduce hazards beyond an ordinary sink trap. Tell the contractor about chemicals previously added and any specialised cleaning undertaken. That information affects the method and the appropriate people or equipment needed for the work.

Choose clearance from the condition and route

The method needs to suit the unit, connected pipework and material present. Removing retained material from the trap is different from clearing a blocked outlet or investigating a damaged downstream run. The proposal should identify which task is being undertaken and what evidence supports it.

A generic instruction to jet every part of the installation can be inappropriate. The contractor should account for the product’s requirements and avoid damaging internal components or forcing contamination elsewhere. Do not use an unapproved chemical or enzyme product as an emergency substitute for finding the blockage. Any waste handling and disposal arrangements should be agreed with the responsible service provider.

Escalate only where the first findings justify it

If the unit is cleared but discharge remains restricted, the next step may concern the outlet or downstream drainage. The contractor should explain what has been established and what remains uncertain. A defined camera inspection or further access can be useful where it answers that remaining question, rather than being added automatically to every clearance.

Costs depend on access, retained material handling, the location of the restriction and any separate drain work. Agree approval points before extending the job beyond the first affected section. If damage is found, distinguish the repair proposal from the clearance already completed. A flowing outlet after one brief test does not prove that an unidentified recurring defect has disappeared.

Check restored flow and communicate remaining restrictions

The completion check should reflect the connected fixtures and the original backup pattern using an appropriate controlled method. The handover needs to state what was cleared, whether accessible connections remain sound and which areas were not inspected. If another service is needed before normal operation, name that dependency clearly.

Keep the findings with the kitchen repair record, including the unit reference and any downstream defect identified. This supports a later recurrence investigation without turning the fault article into a generic maintenance schedule. The important immediate outcome is a known flow path, a documented repair boundary and clear information for the person deciding how the premises returns to use.

Arrange a blockage assessment for the kitchen

Loyal Plumbers can discuss commercial kitchen drainage investigation and the agreed plumbing clearance or repair scope across London and inside the M25. Provide the postcode, affected fixtures, trap model if known, current overflow and available shutdown window. We clarify any specialist waste-handling requirements and site access. Reports or safe photographs can be shared by email after the initial enquiry.