[Machine] The Messenger of Allah ﷺ said, "Water does not become impure except what changes its smell or taste." It was narrated by 'Isa ibn Yunus from Al-Ahwas ibn Hakim from Rashid ibn Sa'd from the Prophet ﷺ as a marfu' hadith. It was also narrated by Abu Usama from Al-Ahwas from Ibn 'Awn, and Rashid ibn Sa'd said the same. However, the hadith is not strong, except that we do not know about the impurity of water when it changes due to impurity, and Allah knows best.  

قَالَ رَسُولُ اللهِ ﷺ الْمَاءُ لَا يَنْجُسُ إِلَّا مَا غَيَّرَ رِيحَهُ أَوْ طَعْمَهُ وَرَوَاهُ عِيسَى بْنُ يُونُسَ عَنِ الْأَحْوَصِ بْنِ حَكِيمٍ عَنْ رَاشِدِ بْنِ سَعْدٍ عَنِ النَّبِيِّ ﷺ مُرْسَلًا وَرَوَاهُ أَبُو أُسَامَةَ عَنِ الْأَحْوَصِ عَنِ ابْنِ عَوْنٍ وَرَاشِدُ بْنُ سَعْدٍ مِنْ قَوْلِهِمَا وَالْحَدِيثُ غَيْرُ قَوِيٍّ إِلَّا أَنَّا لَا نَعْلَمُ فِي نَجَاسَةِ الْمَاءِ إِذَا تَغَيَّرَ بِالنَّجَاسَةِ خِلَافًا وَاللهُ أَعْلَمُ