In the Hanafi school, if a person has Wudu but performs Wudu again for another prayer, what is the legal category of the used water?

Ablution (الوضوء): Absolute Obligations (الفرائض)

• Pure and Purifying (Tahir Mutahhir)
• Pure but non-purifying (Tahir Ghayr Mutahhir)
• Impure Water (Najis)
• Doubtful Water (Mashkuk)