Gallons per flush (gpf) indicates the total volume of water a fixture uses in a single flush cycle. It is the primary metric for water conservation standards in plumbing codes. Older toilets often used 3.5 to 5.0 gpf, while high-efficiency models are rated at 1.28 gpf or lower.
Heard on the job
We need to swap out these old 3.5 gpf dinosaurs for high-efficiency bowls to meet the new code.