Liters per flush, a metric measurement of the water volume used by a toilet or urinal in a single cycle. It is the standard unit for rating the water efficiency of plumbing fixtures in metric regions. High-efficiency toilets typically operate at 4.8 lpf or lower, while older models can use up to 13 lpf.
Heard on the job
We're swapping out all the old commercial flushometers for 4.8 lpf models to meet the new building code.
Insider tip
Lower lpf ratings save water but often require steeper drain pipe grades to carry solid waste effectively without clogging.
Also heard as
- litres per flush
Do not mix it up with
- Gpf: lpf measures volume in liters, while gpf measures in US gallons, with 1 gpf equaling roughly 3.8 lpf.