Flow rates for toilets are expressed on the water rating label in litres per average flush, litres per full flush, and litres per half flush.
The most water efficient toilets have at least a 6 star WELS rating (2.5 litres average flush. 3 L per full flush / 2 L per half flush)
Toilets are tested for:
• endurance of inlet and outlet cistern valves
• performance in discharging material at full and reduced flush
• physical distortion
• water consumption