Octagonal white ceramic plate for "mori-shio" (salt mounds). - Shape: Octagonal - Color: White - Purpose: For "mori-shio" - Material: Ceramic Please use natural coarse salt. You can use salt sold at supermarkets. The frequency of salt replacement depends on the condition of the salt, but when it hardens, sprinkle the salt in the toilet, washroom, bathroom, kitchen, etc. In severe cases, the salt may dissolve in a day. We recommend replacing it daily. Salt has been said to purify since ancient times. Even sumo wrestlers sprinkle salt on the ring. I purchased an octagonal "mori-shio" set at Samukawa Shrine, but this product is sold at Seria, and it's famous and often out of stock. Thank you for viewing.