Tahir means clean in itself, whereas tahur, in this context, is water that can effect ritual purification.
Fresh fruit juice is generally clean but does not replace unrestricted water for wudu. Similarly, vinegar and broth can be clean yet unsuitable for wudu.
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Unrestricted Water, Restricted Liquids, and Clean Admixtures
Tahir means clean in itself, whereas tahur, in this context, is water that can effect ritual purification.
Fresh fruit juice is generally clean but does not replace unrestricted water for wudu. Similarly, vinegar and broth can be clean yet unsuitable for wudu.