| 摘要 |
PROBLEM TO BE SOLVED: To excellently prevent the generation of sliminess by providing air bubble ejection holes on the bottom side of a bathtub so as to raise air bubbles from a lower part to an upper part along the inner side wall surface of the bathtub. SOLUTION: For this bathtub 1, a raised inner side wall surface 1a is formed integrally upwards on the outer periphery of a bottom surface 1b, the air bubbles are raised from the lower part to the upper part along it and the generation of the sliminess of the inner side wall surface 1a is suppressed. Along the inner peripheral edge of the bottom surface 1b, that is the inner peripheral edge on the bottom side of the inner side wall surface 1a, the air bubble ejection holes 5 are formed in the entire area at prescribed intervals. An air pipe is disposed to the outer periphery on a bottom surface side of the bathtub 1 and an air pump through a check valve is connected to it. Also, the air pump is set so as to send out the air amount of about 5-100 liter/minute through the air pipe to the plural air bubble ejection holes 5, the hole diameter of the air bubble ejection hole 5 is 0.3-5mm and a pitch between the respective air bubble ejection holes 5 is set to be less than 100mm. |
