There will be a certain degree of temporary increase. During a spa hot tub session, due to: • Increased heart rate • Enhanced thermoregulation • Accelerated blood circulation The body's energy expenditure will be slightly higher than in a completely resting state. This means that the metabolic level does increase during the bath.

In most cases, the increased heart rate caused by soaking in a spa hot tub is a physiological increase in heart rate, not a pathological problem. This is a normal regulatory response of the heart to maintain stable blood circulation and ensure blood supply to vital organs.

Spa hot tubs: • Improve metabolism through warm water, water pressure, and circulation • Provide a more stable and longer-lasting metabolic boost • Focus more on the overall system's synergistic regulation Steam saunas: • Stimulate metabolism through high temperature and humidity • Produce a stronger but shorter-lasting metabolic response • Rely more on the body's tolerance

pH should be maintained between 7.2 and 7.8 (commonly recommended for swim spa tubs and pools). A pH that is too low can cause acidic skin irritation; a pH that is too high will make the water alkaline, reducing the effectiveness of disinfectants and causing dry skin.

When the swim spa tub is turned off, the water pump stops operating, and the water flow naturally ceases. This means that even if you turn on the tap or drain, the water will not flow or circulate as it would during normal use.

Showering before entering a spa hot tub is not merely a formality of hygiene, but a fundamental usage standard proven over a long period. Spa hot tubs are high-temperature, closed, circulating water systems; any contaminants entering the water will be repeatedly amplified through circulation.