Although identical in appearance, there are two kinds of water vases: the ‘chief’ or ‘main vase’, or tso bum, and the ‘activity’ or ‘working vase’, the lé bum. The main vase is the support for the visualization of the mandala of deities. The activity vase is used for water purification during the different stages of the ritual. In the new Nyingtik tradition, the main vase is placed at the centre of the mandala house or shrine for ceremonies such as empowerment. The activity vase, used by the chöpön, is usually placed on the vajra master’s table.
Also see twenty-five ingredients of the pumba.