You cleanse or pollute water in a single body or container, up to a 50-foot cube. When you cleanse a body of water that is smaller than a 50-foot cube, it is pure and drinkable.
If, however, you cleanse an entire body of water with a tainted inflow, it will remain clean for one day. If you clean a body of water larger than a 50-foot cube, the cleansed portion will stay fresh for 1 hour if there is no current or inflow, or 10 minutes if there is a current or tainted inflow. Multiple castings may be able to treat a larger area, such as an entire oasis, cistern, or well.
When you pollute the water, it becomes acrid and vile. Any creatures ingesting the water or breathing the water (i.e. most aquatic creatures in the water)must make a constitution saving throw or take 3d6 poison damage and be poisoned for 24 hours. Each hour a creature poisoned from this water must make another Constitution saving throw or take 1d12 damage. A creature poisoned by this spell is no longer poisoned after three successful saving throws. A polluted part of a body of water disperses at the same rate that purified water does
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