Water that was pure, and it is not known whether it has become impure or not, is pure. Water that was impure, and it is not known whether it has become pure or not, is impure. [1] The number of times a particular object has to be washed for it to be purified depends on the type of object it is, the thing that made it impure, and the type of water it is washed with.
For example, a utensil that has become impure with wine is purified by washing it three times with kurr water, flowing water, or suchlike. See