What is prasuk jal

Prasuk jal in Jain Dharma means water prepared in a way that makes it less हिंसक (less harmful) for use, usually boiled and/or filtered water. It is preferred because Jain practice emphasizes ahimsa even in small actions like drinking water. ( jainknowledge.com)

In simple words:

• Raw or unprocessed water is avoided when possible.
• Prasuk jal is the acceptable, purified water used for drinking and certain religious practices. ( jainknowledge.com)

In Jain tradition, this careful use of water reflects respect for the tiny life forms believed to exist in water. ( jainknowledge.com)