This document provides an introduction and overview of the rules regarding different types of water that are considered pure according to Islamic law. It discusses seven types of water that are considered pure, including rainwater, sea water, river water, well water, water from snow/hail, and fountain water. It further categorizes waters and discusses when mixing of substances causes water to lose its purity status. The document provides technical definitions and guidelines regarding quantities and mixtures. It aims to elucidate the correct rulings for purification according to sacred texts and scholarly consensus.