or with soap, ishnan (alkaline plant), lotus leaves, or any other pure substance, and that admixture does not dominate the water. On this question the scholars give various nuanced opinions; yet the sound view is that the water remains ṭahūr—pure in itself and purifying—so it may be used to lift a state of ritual impurity and to cleanse filth.
On this basis we may say that water is divided into two categories:
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Ṭahūr: water that can lawfully be used for purification, whether it has stayed in its original form or has been mixed with a pure substance that neither overpowers it nor deprives it of the name “water.”
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Najis: impure water that may not be used, for it neither removes ritual impurity nor eliminates physical defilement. This is water whose characteristics have been altered by contact with impurity.
Allah knows best.