nor is Zamzam water disliked, except when it is employed for removing filth.
4 – Water whose use is not disliked includes sea water, well-water, spring water, river water, bath-house water,1 water heated by the sun, and water whose characteristics have altered because it has sat for a long time or because a wind blew over it from a carcass or the like, or water affected by things that are difficult to keep away from it—such as algae or fallen leaves—so long as those substances were not intentionally placed in it.
Second: ṭāhir (pure) water whose use is permissible for purposes other than lifting ḥadath (ritual impurity) or removing khabath (tangible filth).2 This is water whose color, taste, or smell has been greatly altered by some pure substance. If that alteration disappears on its own,3 the water returns to being ṭahūr (purifying).
Also classed as ṭāhir is a small amount of water that has been used to lift a state of ritual impurity, or water into which the entire hand of an adult, legally accountable Muslim—who has slept at night a sleep that nullifies ablution—has been dipped before he has washed it three times, doing so with intention and pronouncing the basmala; this washing is obligatory.
Third: najis (impure) water, the use of which is forbidden except in cases of necessity; it neither lifts ritual impurity nor removes filth. This is water into which an impurity has fallen while the amount is small, or water that is plentiful but one of its attributes has been altered by that impurity.
If the alteration vanishes on its own, or through the addition of purifying water, or by drawing some of it off so that what remains