Conditions for the correctness of Wudhu

 There are thirteen conditions for a correct Wudhu:

First condition: The water for Wudhu should be Pak.

Second condition: The water should be pure (and not mixed).

271. Wudhu performed with Najis or mixed water is void, even if one may not be aware of its being Najis, or mixed, or may have forgotten about it. And if one has offered prayers with that Wudhu, one should repeat that prayers with a valid Wudhu.