Purity: Purification of Tanūr and Pools without the Ruling of Utensils
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 152
A tanūr,[3]1 a pool of water, and suchlike do not have the rule of utensils and therefore become pure with one washing. If a tanūr or pool of water do not have holes or outlets through which water can drain and water collects at the bottom, then in the event that one wants to purify the area with qalīl water, he must take out the water with a cloth, sponge, container, and suchlike.
-Ayatullah Sistani, Practical Laws of Islam, Purification (Taharah)
1
[3] A tanūr is a fire-heated oven for baking bread.