When the swim spa tub activates its jet system or strong water flow, the water is rapidly agitated, drawing in a large amount of air. If substances in the water stabilize these bubbles, they won't burst immediately but will instead gather at the surface, forming foam.

Regular spa hot tubs only maintain water temperature, while hydrotherapy spa hot tubs focus on the combination of water flow and air pressure. If you want to achieve a therapeutic or deep relaxation effect with a spa hot tub, a regular model is difficult to achieve, while a dedicated hydrotherapy spa hot tub is the true hydrotherapy equipment.

In a dry indoor environment with a temperature maintained between 15°C and 30°C, a spa hot tub can typically be left unused for 2-3 months without significant damage. If exposed to the outdoors, wind and sun will accelerate the aging of the casing and seals. Even with a dust cover, it is recommended not to leave it unused for more than 4-6 weeks.

Swim spa tubs are not "only" placed on concrete floors, but they must be placed on floors that meet the requirements for load-bearing capacity and stability. Concrete floors are simply the easiest way to meet these requirements.

The water temperature is typically maintained at 37–40°C. Full-body immersion causes peripheral vasodilation and accelerated circulation. This not only helps with overall relaxation but also improves nasal blood flow, gradually reducing swollen mucosa and alleviating nasal congestion.

If the swim spa tub is primarily used for aquatic exercise or rehabilitation training, the ideal temperature is 26°C–30°C. This temperature range helps maintain alertness, prevents overheating, and preserves athletic performance.