The warm stimulation of a hydrotherapy spa bathtub prompts the brain to release endorphins, the "happy hormone." Its effects are similar to morphine, but without side effects. People feel light, calm, and even experience increased happiness during hydrotherapy sessions, which is a result of the effects of endorphins.

When boiling water is poured directly into an outdoor acrylic spa bathtub, the instantaneous high temperature may cause temperature difference stress in the bathtub material. This uneven heating process may cause tiny cracks or even complete rupture of acrylic.

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Using a soft brush to clean the nozzle is a common method to remove mold from a massage spa bathtub. Choose a suitable brush head and gently scrub the nozzle and water flow channel to remove mold. By scrubbing, you can remove the surface layer of mold and clean up the debris accumulated on the surface of the nozzle.