Grease trap and grease line service for kitchens that cannot close

In everyday use the terms get swapped freely, but the distinction is size and location. A grease trap is the smaller under-sink or on-floor unit serving one or two fixtures, typically rated in the tens of pounds, and it needs frequent attention because its capacity is small. An interceptor is the larger in-ground or exterior tank serving the whole kitchen, often several hundred to a few thousand gallons, pumped on a schedule by a permitted hauler. Many kitchens have both, and they fail differently.

The practical rule most jurisdictions work from is that service is due before the accumulated grease and solids reach about a quarter of the unit’s liquid depth, which for a busy kitchen with a small under-sink trap can mean weekly or fortnightly, and for a properly sized exterior interceptor commonly every one to three months. Frying volume drives it more than covers do. The reliable way to set the interval is to measure the layer at each visit and adjust.

Because pumping the tank and cleaning the pipe are two different jobs. A hauler removes what has collected in the interceptor. It does nothing to the grease that has already cooled and hardened on the inside of the pipe run between your fixtures and that tank, and that is where most kitchen backups actually originate. The complete program is interceptor service plus periodic line jetting. Doing only the first is the most common reason a well-maintained kitchen still floods.

It builds and then it goes all at once. First the floor sink near the dish area drains a little slower. Then the three-compartment sink holds water. Then wastewater surfaces at the lowest opening in the kitchen, which is usually a floor drain in the middle of the workspace, during service. At that point you have a sanitation problem in a food preparation area and a decision about whether you can keep serving. Almost every one of these is preventable on a schedule.

Yes, and that is the normal expectation. Grease line jetting and trap service are scheduled after close or before opening: hoses through a service area, an open cleanout and standing water do not belong in an operating kitchen. Larger interceptor pumping is coordinated for the same window. If a line has already failed and you are actively shutting down, it becomes an emergency call and the timing question changes, but planned work should never cost you covers.

Keep dated records of every trap and interceptor service, the volume removed, the hauler’s manifests, and the dates of any line jetting or camera inspection. Health and wastewater authorities want to see a maintenance program rather than a single receipt, and if a discharge issue is ever raised, a consistent log is the difference between a conversation and a citation. Any plumber servicing your kitchen should be leaving you documentation without being asked twice.

They have a limited, specific role and they are not a substitute for physical removal. Biological products can help control odour and break down some residual film in a line that is already being cleaned mechanically. What they cannot do is dissolve an accumulated deposit, empty an interceptor, or replace jetting. Be particularly cautious with anything that emulsifies grease so it passes through the trap. That moves the problem to the public sewer, which is precisely what the regulations exist to prevent.

It depends on the lease and on where the fault sits, which are two separate questions. The lease sets out whether the tenant or the landlord maintains the interceptor and the branch lines; the physical location of a blockage determines whose branch failed or whether it is in shared infrastructure. This is where a camera inspection earns its cost several times over: a recording of where the obstruction sat resolves the question with evidence instead of two opinions and a lawyer. See restaurant and commercial plumbing.

Undersizing is common, particularly where a space has changed hands and the current menu is heavier than whatever the original tenant cooked. The signals are an interceptor that needs pumping far more often than its rating suggests, grease carrying past it into the line, and repeat blockages downstream. Flow rate from the fixtures, the number of compartments and cooking volume all feed the calculation. Sometimes the answer is a bigger unit; often it is better fixture-level trapping plus a tighter service interval.

Yes, and it is frequently overlooked. Butchery, seafood counters, hot-food and deli operations inside markets, bakeries, noodle and tofu producers and central kitchens all discharge fats, oils and fine solids, and their lines coat exactly the way a restaurant’s do. Westminster has a great many of these businesses, and quite a few operate in buildings whose plumbing was never intended for food production. The same program applies: fixture-level trapping, interceptor service and periodic jetting.

Four things, in order of impact. Dry-wipe and scrape pans and plates before they reach a sink so fat goes into the waste stream, not the drain. Collect used fryer oil for the recycler rather than pouring anything down a drain. Fit and actually clean the strainers on every fixture. And keep the service interval short enough that the layer never gets near the point where grease carries past the trap. Those four cut emergency callouts more than any product on the market.