The psammotherapy there has been believed to be as effective as insam.

According to Ryom Jong Chol, section chief of the Kaesong City People's Committee, sand in Mami Streamlet contains Mg, Fe, Cu, Si, Mn, Ca, carbonate and other ingredients good for human body.

The treatment by sand bath is efficacious for rheumatic arthritis, neuralgia, bruise, postoperative complication, cholelithiasis, dermatosis and various chronic diseases.

Kim Yong Hui, an inhabitant in Poson-dong, Kaesong City, said that she was getting better of brachialgia after three days of psammotherapy.