What is toh of rice?

TOH (Total Organic Hardness) of rice is a measure of the level of organic matter or impurities present in the water used to cook the rice. It is a measure of the hardness of water, which is influenced by the presence of calcium and magnesium ions in the water. The higher the TOH value, the harder the water, which can have a negative effect on the texture and taste of the cooked rice. Generally, a TOH value of less than 100 ppm (parts per million) is considered acceptable for rice cooking. However, the exact TOH level may vary depending on the type of rice and cooking method used. Some methods of water treatment, such as filtering and boiling, can help reduce the TOH levels in water and improve the quality of the cooked rice.