بسم الله الرحمن الرحيم

Zamzam water is blessed water.  It is a Shari responsibility to respect the water and consider its etiquettes.  Therefore, it is makrooh (reprehensible) for a person who does not have wudhu to perform wudhu with it, provided that there is alternative water available, otherwise it is permissible without any dislike.  However, in every case, to use its water for the purpose of ghusl for janaaba is not free from dislike nor is it permissible to do istinjaa with it without any dislike.  However, if a person with wudhu performs wudhu with it as a blessing or a person with a pure body performs ghusl with it, then it is permissible without any dislike.

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للمفتي محمد أشرف الاشاعتي

Vol.1 Pg.133