11.   The four swimmers who tested positive to a diuretic, which can flush the system of drugs, face up to a two-year ban from the sport.

12.   The system is then flushed and the entire treatment repeated.

13.   Water mains have been opened, and water gushed down curbs as the system was flushed.

14.   Water mains have been opened, and water gushed down curbs while the system was flushed.

15.   The system was flushed with helium and restored to full power shortly before liftoff.