Grease Trap Cleaning Service Service in Bangkok

When Your Drain Stops Draining

It starts small. The kitchen sink takes a few extra seconds to empty after washing dishes. Then you notice a smell near the drain, something sour and greasy that does not go away with bleach. A week later, water pools on the kitchen floor because the drain cannot handle the volume. By this point, your grease trap is well past full, and the problem is heading toward your plumbing lines.

What a Grease Trap Actually Does

A grease trap is a simple containment device installed between your kitchen drain and the sewer line. Water flows through it slowly enough for fats, oils, and grease (FOG) to float to the surface and solids to settle to the bottom. Relatively clean water passes through to the sewer. The trap holds the grease until it is manually removed. If the trap is not cleaned regularly, the grease layer thickens until it blocks the outlet, and all your kitchen wastewater has nowhere to go.

Residential vs. Commercial Traps

Under-Sink Traps (Residential)

Small plastic or metal units installed under the kitchen sink. Capacity is typically 10 to 30 liters. These need cleaning every 1 to 3 months depending on cooking frequency. In Thai kitchens with daily oil-heavy cooking, monthly cleaning is advisable.

In-Ground Traps (Commercial)

Larger concrete or fiberglass units buried outside the kitchen. Capacity ranges from 100 to over 1,000 liters. Restaurants, food courts, and hotels require these by Bangkok municipal regulation. They need professional pump-out every 1 to 3 months to remain compliant.

What Happens During Professional Cleaning

1. Grease level check: The trap is opened and the thickness of the grease layer is measured. This determines whether a simple clean or a full pump-out is needed.
2. Pump-out: All accumulated fats, oils, solids, and wastewater are pumped into a sealed transport container. Nothing goes down your drain.
3. Interior scrub: The walls, baffles, and inlet/outlet pipes inside the trap are scrubbed to remove adhered grease that the pump cannot reach.
4. Flow test: Water is run through the system to confirm that the trap drains freely and the outlet pipe is clear.
5. Waste disposal: Removed grease waste is transported to an authorized disposal facility. Proper disposal documentation is available for businesses that need compliance records.

Warning Signs You Should Not Ignore

Slow drainage is the earliest sign. Foul odors from the sink area mean bacteria are feeding on trapped grease. Grease backing up into the sink means the trap is at or past capacity. Fruit flies or drain flies around the kitchen sink often breed inside neglected grease traps. If any of these are present, cleaning is overdue.

Why Regular Cleaning Saves Money

A grease trap cleaning costs a fraction of what a plumber charges to clear a grease-blocked sewer line. Severe blockages that reach the main building drain can cost tens of thousands of baht to resolve and may affect other units in a shared building. For restaurants, a blocked grease trap can mean shutting down the kitchen until the problem is fixed, losing revenue for every hour of closure.