In Jain practice, boiled and filtered water should be used fresh and not kept long.

• For householders (Shravak/Shravika): use within 24 hours of boiling. In the monsoon (Chaturmas), follow a stricter limit—use within about 12 hours.
• Do not mix old and new water. Keep it covered, avoid repeated opening, and discard if taste or smell changes.
• Monastic rules can be stricter and are followed as per the Guru’s maryada; householders should follow the guidance of their local tradition (Digambar or Shwetambar).

This keeps ahimsa intact by minimizing new life-forms in stored water.