The appearance of the WP400 water purifier is characterised by a cylindrical housing. This form is based on the Chinese cosmology concept of the “upper circle and lower square”. The result is a water purifier with a geometric body and an easily understandable button operation. Light displays indicate the status of the device and the filter in three colours. By means of its vertical construction, the WP400 is space-saving and at the same time copes with the purification of large volumes of water.