In the old times, the purification was made by washing directly in a spring or river flowing close to the shrine. It is considered that the first temizuya was built at the Toshougu Shrine from Nikko, and the basin (in the photo) was donated by the Nabeshima clan in 1618.
EXIF info:
Nikon D300
Lens: 18-70mm F/3.5-4.5G
Focal Length: 18mm
Aperture: F/6.3
Shutter Speed: 1/400s
ISO Sensitivity: ISO 320