Grease trap size is the quiet decision that shapes both your trade waste compliance and what you pay to service the trap for years afterward. Too small and you are pumping out constantly and still failing checks. Too large and you have paid for capacity you never use.
Size is driven by the fixtures and the load, not the floor space. The number of sinks, dishwashers and combi ovens plumbed to the trap, the peak flow through them, and how fat heavy the menu is all feed into the sizing. A fryer heavy takeaway loads a trap far faster than a salad bar with the same number of sinks.
Your trade waste authority usually sets a minimum size for the type and scale of kitchen, so the sizing is not a free choice. Getting it right at fit out is much cheaper than retrofitting a bigger unit later when you keep failing inspections.
If you have inherited a trap and do not know its size, that is fine. An operator can read it on site and tell you the capacity, and whether your current servicing cycle actually suits it.
When you book through Grease Traps Australia, choose your trap size or mark it unknown and add notes. The operator confirms the size on site before the job is accepted, so the price is right the first time.