Cloud of Purification

This spell creates a billowy cloud of magical vapors that moves in the direction of the prevailing wind at a rate of 20 feet per round. A strong wind (greater than 15 miles per hour) breaks it up in 4 rounds, and a greater wind (25 MPH or more) prevents the use of the spell. Thick vegetation disperses the cloud in 2 rounds.
The cloud of purification transmutes organic filth, garbage, and vermin (mice, rats, rot grubs, and so on) into an equal quantity of pure water. For example, a nest of rot grubs caught in the cloud would "melt," becoming small puddles of clean water. If the spell is cast over a body of water, the cloud merges with a portion of the water equal to its own size, transmuting any filth, mi- crobes, small fish, or other "impurities" into clean water.
The cloud's vapors are heavier than air, so they sink to the lowest level of the land (even down holes in the ground). Thus, this spell is perfect for cleansing a sewer or well.
This spell in no way affects magical creatures or creatures larger than a normal rat.

[Tome of Magic]

Sphere: Elemental Air, Water
(Evocation)
Level: 5

Range: 30 yards
Components: V, S
Duration: 1 round/level
Casting Time: 5
Area of Effect: 20-foot cube
Saving Throw: None