A few nice Water Purification images I found:
Image by jpellgen
A chozuya (purification fountain) to the left of the main structures of Gango-ji as one enters from the main gate. Purification is an important ceremonial ritual used before praying or approaching sacred areas. As in most Japanese tradition, left hand before right hand… And you might consider rinsing your mouth as well.
Gango-ji is a Buddhist temple of the Shingon sect known as one of the seven great temples of Nara (nanto shichi daiji). It’s history dates back to the Asuka period, but was moved to the Nara city area around 718 AD. Although it isn’t as extravagant as Todai-ji or other temples in the area, it is a UNSECO world heritage site for it’s historical significance–most notably, the roof tiles of the gyogi-buki style which are close to 1400 years old.
Image by embleton_s
Purification trough in a Japanese Temple