Question: While performing the wodhu there is left over water in the container or jug. I heard that this left over water becomes haram. Is this statement true?

Answer: During performing wodhu, the left over water in container or jug does not becomes impure, this statement is false. It remains pure as it is. No left over water makes the container or the jug impure.

However, if the left over water is more in amount than the used water, in jug or container, then the same person or other person cannot perform wodhu with this water.

Moreover, this water can be used for other reasons such as washing clothes. In contrast to the above, if the left over water is less in amount than that is used, then wodhu can be done.

Reference: [1] Fatwa Alamgiri vol-1, p-23 [2] Ahsanul fatw vol-2, p-40