Purification (Ṭahãra)

Purification is valid with the following types of water : rain water, well water, spring water, river water, sea water [even if salty], and water from melted snow and hail.

Such water may be used for purification as long as it remains “purifying”, namely, to remain with its natural characteristics, with nothing having mixed with it such as to “condition” it and thereby remove its “purifying” quality.

This ruling applies whether the water is flowing or in a large cistern, namely one with a surface area of at least ten by ten cubits with a depth such that its floor is not exposed by scooping water out with both hands.

Ref : Ascent To Felicity

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