From what I found on the Internet, a brief shower is more water efficient than a bath. I was wondering if there is any research about water use with more than one person using a shower? My gut feeling is that two people showering uses around 150% of a one person shower.
Notoriety is established with the the following catch phrase Have a shower with your fella, Stella which was part of Australian government TV campaign during water restrictions a few years back. The implication is that two-person showering saves water.
Australian campaign cited here
Everyday we are encouraged to stop wasting water, from the catchy jingle produced by the campaign group Waterwise with the memorable line ‘Have a shower with your fella stella,’
Humorous advice on water saving strategies, such as in the Australian advertisement with the tagline "Take a shower with your fella, Stella," may soon become legal directives.'
From another page not based on the australian campaign
- share a shower with your partner, since it will usually use less water than two separate showers