1) Wash the tumbler thoroughly.(do not use any kind of detergents.simply wash in running tap water). 2) Pour drinking water (Approx.80-100 ml) in munnalaldawasaz Vijaysar Herbal Wooden Tumbler at night. After 8-10 hours the water will turn brown in color. Consume this colored water 30 minutes before breakfast. Once again pour drinking water in munnalaldawasaz Vijaysar tumbler and consume it 30 minutes before dinner. 3) Repeat the use of munnalaldawasaz Vijaysar Herbal Wooden Tumbler continuously for 30 days and when the color of water stops changing, scratch the inside of the glass carefully without hurting yourself and use again for 7-15 days. Use munnalaldawasaz Vijaysar Herbal Wooden Tumbler maximum for 45 days. Use a New Tumbler after every 45 days. Please Note : This particular herbal wood has tendency to develop cracks/leakages during use sometimes. Such instances does not reduce medicinal value of this product. In such cases, simply place the wooden tumbler in any vessel/container and keep using. We have not used any abrasive/polishing material inside or outside the tumbler. it is 100% Natural product.