What is the ruling on washing one's feet with the ablution water collected in a container?

Scholars have differed concerning the ruling on washing the feet with used water. The Malikis and some scholars are of the view that it is pure and purifying, as long as it has not changed, but it is disliked to use it when other water is available. Sheikh al-Islam Ibn Taymiyyah held the view that purification with used water is permissible, because it remains in its state of purity. Whereas the majority of scholars are of the view that water used for an obligatory purification is not valid for ablution, and this opinion is more cautious as it avoids disagreement.