Stagnant water is generally disqualified when impurity enters, with the specifically defined distant-side exception for extensive ponds.
Running water may be used when no legally relevant effect remains; water at an affected point is not treated as unaffected.
Creatures lacking flowing blood and creatures that live in water are separate exceptions concerning death in water, with recognised juristic disagreements about their scope.
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Impurity in Stagnant and Running Water, Large Ponds, and Aquatic Creatures
Stagnant water is generally disqualified when impurity enters, with the specifically defined distant-side exception for extensive ponds.
Running water may be used when no legally relevant effect remains; water at an affected point is not treated as unaffected.
Creatures lacking flowing blood and creatures that live in water are separate exceptions concerning death in water, with recognised juristic disagreements about their scope.