Purity: Ruling on Impurity When Part of Kurr Water Freezes

Practical Laws of Islam as per the teachings of Ayatullah Sistani

Ruling 20

If some part of kurr water freezes and the remaining water does not amount to kurr, in the event that an impurity comes into contact with it, it becomes impure; and however much of the ice melts is also impure.

-Ayatullah Sistani, Practical Laws of Islam, Purification (Taharah)