It has been narrated by Ali al-Ridha that if a drop of urine, blood or animal feces falls into a well, one must remove about ten buckets from it before performing wudu. If the feces has disintegrated into the water, forty to fifty buckets must be removed. Ja'far al-Sadiq has also mentioned that if an animal falls into the well, and has not disintegrated in it, remove five to seven buckets of water from it or until the smell or taste of the water changes. However, If the animal is bleeding or has an open wound, one must draw out thirty to forty buckets before it becomes purified for wudu. If a camel dies in the well or wine is poured into the well, all the water must be drained.