Clean unused rainwater or well water normally remains capable of purification unless another legal impediment arises. Water that has been used to remove hadath or for devotion may acquire the legal status of musta‘mal.
The difference need not appear in colour, smell or taste; it concerns the water’s legally relevant use.
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Used Water: Definition, Ruling and Juristic Differences
Clean unused rainwater or well water normally remains capable of purification unless another legal impediment arises. Water that has been used to remove hadath or for devotion may acquire the legal status of musta‘mal.
The difference need not appear in colour, smell or taste; it concerns the water’s legally relevant use.