The Case of a Well and Things that May Fall in It (Fatwa best explains Ahadith 2-12 as well as the following chapter.)

7. Ahmad ibn Idris has narrated from Muhammad ‘Abd al-Jabbar from Safwan from ibn Muskan from al-Halabiy who has said the following: “Abu ‘Abd Allah عليه السلام, has said, ‘If something small falls in a well and dies, then take a few buckets of water out. If a person involved in sexual activities (because of which Ghusl (bath) is obligatory) falls in it, you must draw seven buckets of water out thereof. If a camel dies in it or wine is poured in it then you must draw out all of the water.”’