Abu Sa'id al-Khudri · The Book on Purification

"It was said, 'O Allah's Messenger! Shall we use the water of Buda'ah well to perform ablution while it is a well in which menstruation rags, flesh of dogs and the putrid are dumped?" Allah's Messenger said: 'Indeed water is pure, nothing makes it impure.'"

the Prophet said: When one of you comes to his wife, then he wants to repeat (it), let him perform Wudu between them."