Abstract: In recent years, hot springs have become a part of modern medical rehabilitation and recuperation. Furthermore, hot springs are said to speed recovery from illness and protect against further ailment. The hot springs are inherited natural resource and it is necessary to preserve them for future generations. The study was carried out for the removal test of scale in hot spring by use of the ceramics fluidization treatment device in two locations of the Shiohitashi hot spring and the Obama hot spring in Japan. The results showed that scale of Shiohitashi hot spring was characteristic of containing large amount of iron ion and small amounts of calcium ion. The color of scale was reddish brown under the influence of them. However, the scale of Obama hot spring contained large amount of calcium ion, which increased twice as much as that before treatment and the color was white. These results made clear that removal of scale in hot spring by ceramics fluidization took effect on calcium ion. Although chloride in the sea might increase effects, it should be proved by the continuous experiments.