- PertPlus Chicago Firefighters
- 30.48 square metre(s)
- United States (Chicago)
The largest shower measured 30.48 m (100 ft) long, 12.19 m (40 ft) wide, and 3.04 m (10 ft) tall and was manufactured by PertPlus in conjunction with the Chicago firefighters (all USA) at Six Flags Great America and Hurricane Harbour in Gurnee, USA, on 9 July 2009. They also attempted the most people showering simultaneously at the same event.