Grease Trap Cleaning & Installation in Ottawa

How Often a Grease Trap Needs Pumping, and Why

A grease trap needs servicing when the grease and solids inside it have eaten enough of its volume that water no longer sits still long enough to separate, and the working rule most operators use is to pump out before the combined floating grease layer and settled solids reach about a quarter of the unit's depth. That translates to very different calendars in different kitchens. A small under-sink hydromechanical unit in a cafe can hit that point in a week or two. A large in-ground interceptor behind a full-service restaurant may run one to three months. The variable is not the calendar, it is how much fat, oil and grease your menu and your dish routine produce against the capacity you installed. We measure the layers on the first visit and set the interval from what we find, then adjust it once there is a service history to read.

Sizing and flow

Most Grease Problems Start With Sizing

Sizing is where most grease problems start, and it is decided by flow, not by floor space. An interceptor is matched to the drainage flow rate of the fixtures tied into it – typically the three-compartment sink, the pre-rinse station, the pot sink, the wok or fryer station and any floor sinks in the cook line – based on the volume those fixtures hold and how fast they drain down. Undersize it and water sprints through faster than grease can rise, so the unit reads as working while the grease is already in your lateral. Two details matter as much as the rating. A flow control fitting ahead of the trap keeps incoming flow inside the design rate instead of dumping a full sink into it at once. And a commercial dishwasher generally should not discharge into a grease trap at all, because the water is hot enough and the detergent aggressive enough to hold the grease emulsified straight through the unit and out the other side. Food waste disposers are the other common mistake, since they load the interceptor with solids it was never sized to hold.

A Pump-Out Is Not a Skim

There is a real difference between a pump-out and a skim, and it is the difference most kitchens are unknowingly paying for. Skimming pulls the floating grease cap off the top, which makes the unit look clean for a day and leaves the settled solids and the emulsified layer in place. A full service evacuates the entire contents, scrapes the walls, baffles and inlet and outlet tees, clears the solids off the bottom, inspects the baffles for damage or displacement, checks the flow control and the vented air intake, and refills the unit with water so it is ready to separate on the next shift. A displaced or corroded baffle is worth catching, because it lets incoming flow short-circuit straight to the outlet and the trap stops working while the invoices keep arriving. Additive products that claim to dissolve grease are worth being sceptical about: emulsifying grease does not remove it, it just moves the problem past your trap and into your lateral, where it cools and hardens again.

What happens at the sink between visits decides the interval as much as the hardware does. Dry-wiping pans and scraping plates into the waste bin instead of the disposer keeps both grease and solids out of the trap in the first place. A solids strainer on the pot sink stops rice, pasta and vegetable trim from filling the bottom of the chamber with material that has nothing to do with grease. Fryer oil belongs in a collection bin and never in a drain, at any temperature. Hot water does not solve anything: it simply carries liquefied grease further along the line to a colder section where it sets again, usually somewhere you cannot reach. Staff turnover is the quiet variable in all of this, because habits reset with every new hire, and a kitchen that had a twelve-week interval last year can find itself blocking in six without anything about the equipment having changed.

When a Trap Has Been Left Too Long

The symptoms of an overdue trap arrive in a predictable order. First the kitchen drains slow, usually at the fixture furthest from the trap. Then odour appears near the unit or at a floor drain, worst at the start of a shift when the traps have sat. Then the line beyond the interceptor blocks entirely, and that is the version that happens at the worst possible moment, because the load that finally closes it is the dinner rush. By that point the fix is no longer a pump-out – it is hydro jetting the lateral to cut hardened grease off the pipe wall, and sometimes a camera run to check the line has not been narrowed permanently. Getting on a set interval is cheaper than any of that. Our commercial plumbing team in Ottawa can put a property on a fixed cycle, handle the pump-outs and the paperwork together, and size and install a new interceptor for a kitchen build-out or a menu change that has outgrown the original unit.