The higher the temperature of the whirlpool hot tub, the more pronounced the effect on blood pressure—generally manifesting as a temporary decrease, but with an increased burden on the cardiovascular system.

• Large outdoor whirlpool hot tubs (>2000 liters): Recommended starting dosage of 3–4 chlorine tablets. • Medium-sized home whirlpool hot tubs (1000–1500 liters): Recommended dosage of 1–2 tablets. • Small single-person tubs (<800 liters): 1 tablet is sufficient.

One of the primary purposes of a whirlpool hot tub is to promote relaxation and pain relief. For arthritis patients, pain stems from inflammation, soft tissue tension, and limited mobility. The combination of heat and water flow in a whirlpool hot tub can alleviate pain.

The ideal energy-saving temperature for a whirlpool hot tub should be maintained between 34℃–37℃. This range ensures a comfortable spa experience while avoiding unnecessary energy consumption. If the equipment is operated outdoors or in cold climates, the minimum temperature can be increased by 1–2℃ to prevent excessive heat loss.

According to the Centers for Disease Control and Prevention (CDC) and the Consumer Product Safety Commission (CPSC), whirlpool hot tub water temperatures should never exceed 104°F (40°C). This is because at this temperature, the human body maintains normal thermoregulation and avoids hyperthermia.

Whirlpool hot tub water often uses an alkaline or acidic adjuster to maintain the pH within the appropriate range to prevent corrosion and minimize equipment damage. Excessively high or low pH levels can significantly affect plants and lawn soil, disrupting the soil's acid-base balance.