Here is a video and some images from the Water for Thought: Life-Changing Design exhibition currently running in London (until 23 March 2013). In the video you will see the Hippo water roller at 50 sec. and 1min 50 sec.
Some of the World's most innovative product designs for accessing, transporting or purifying water in developing countries are on show at the Roca London Gallery. Do visit the Roca London Gallery Facebook page for more photo's and videos.
This video provides background to the exhibition and gives glimpses of the solutions on display.