Commercial Grease Trap Cleaning

Multi-tenant interceptors and who is actually filling them

A shared interceptor under a shopping center or a food hall gets filled by whichever tenants cook the heaviest, and the service interval gets set by them rather than by the average. A pizza place with two fryers and a wok line will load a common interceptor several times faster than the sandwich shop three doors down, and the interceptor does not care whose lease says what. Property managers who track which tenants drive the loading can have a sensible conversation with them, backed by service records and photos rather than a hunch. Without that record, everybody pays the same share of a bill somebody else earned, and the tenants who cook light are the ones who complain loudest, because they are the ones who are right.

Supermarkets are their own animal

A supermarket is several food operations sharing a building. Deli, bakery, hot food, seafood and rotisserie all contribute, often through drains installed at different times, and the interceptor sizing frequently reflects the store as it was built rather than the store as it operates today. Add a rotisserie program to a store designed before rotisserie was a department and the loading changes without anybody revisiting the schedule. Seafood adds solids that settle rather than float, which is a different problem from grease and gets missed by anyone servicing from the top down. Those sites reward paying attention, and they punish a vendor who runs every store on the same calendar because the chain has one.

The 25 percent threshold on a commercial interceptor

The working rule is the same at every scale: service when fats, oils and grease reach a quarter of the trap’s capacity, or every three months, whichever lands first. What changes on a commercial site is how fast a quarter arrives. A trap past that point has lost the quiet volume it needs to let grease float and solids settle, so wastewater starts moving through faster than separation can happen and FOG rides out into the lateral. That is where the blocked line and the backed-up dish pit come from. On a busy interceptor, quarterly can be twice as long as the trap can hold, which is why we would rather set the interval from two or three real services than from a number on a page.

A complete service, not a skim

Complete means the grease cap, the wastewater and the bottom solids all leave the structure, then somebody scrapes the walls and the baffles, then somebody looks at the hardware. Baffles, inlet and outlet tees and the flow restrictor are what make a trap separate at all, and a missing or broken baffle turns an interceptor into a holding tank that passes everything through. Cracked walls and a settling structure show up the same way. On an indoor unit under a three-compartment sink the whole job takes minutes and still gets done properly. On a large in-ground interceptor out behind the loading dock it is a longer visit with a confined-space mindset, but the definition of finished does not change.

Scheduling around service, not around us

Kitchens are open when this work is inconvenient and closed when it is not. Running around the clock means the service can happen in the window that suits the operation, which is the difference between a maintenance program that holds and one that keeps getting pushed. Overnight on a restaurant row, pre-opening at a supermarket, between events at a hotel. We would rather move our night than move your service, and once the window is set for a location it tends to stay set, which is how the interval actually holds over a year.

Worth knowing

If you run several locations, ask for the records in one consistent format from the start. Reconstructing a year of service history across multiple vendors before an inspection is nobody’s idea of a good week.