others have said he should simply pour the water away.

As for the second vessel, if the water in it is doubtful, that doubt does not affect its ruling, for the water remains upon its original purity. He may therefore perform wuḍūʾ with it, and he incurs no blame so long as the water shows no sign of impurity—its color, taste, or odor having undergone no change. This is the soundest opinion on the issue.

The same principle applies to clothing and to the ground: both are deemed pure, and nothing from either must be washed until impurity is established with certainty; once certainty is reached, the affected area must be washed. Mere sprinkling (naḍḥ) does not in itself remove impurity; its only purpose is to silence obsessive misgivings, functioning rather like a recommended practice for situations of doubt in matters where purification is not strictly required.