Nirmali Batan (Strychnos potatorum Linn) are the seeds of a tree native to India and parts of Asia. These small, hard seeds are traditionally used for natural water purification and are recognized for their unique ability to clarify turbid water. Nirmali seeds are also used in various traditional practices and preparations. They contain plant-based compounds, including alkaloids and tannins, and are valued for their distinctive properties in both culinary and household uses.