Abstract: A bathtub foam generating device, including a sealed motor housing (5), a motor mounted in the motor housing and powered by a direct current power source, one or more floatable tubes (7) extending from the motor housing in each of which is rotatably mounted a propeller (20) driven by the motor, and a floatable foam discharge chamber (12) in fluid communication with a corresponding tube interior, each of the discharge chambers being formed with an opening (8) through which bathtub liquid is admitted into the corresponding tube interior and from which foam generated in the chamber is discharged, wherein the foam generating device is configured such that a bathtub liquid depth within each of the tubes is less than the length of two propeller blades.