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A water softener is a product specifically designed to reduce calcium and magnesium ions in water and is commonly used in home water softening systems. For outdoor whirlpool spa tubs, users can use a water softener when filling the water to reduce the hardness of the water.

The reasons for chlorine depletion in outdoor whirlpool spa tubs are: 1. Temperature 2. Frequent use of whirlpool spa tubs 3. Organic contamination 4. Number and weight of spa users 5. Environmental factors (pollutants, dust, pollen, insects) 6. Chemicals and detergents

In fact, the answer is: it can be both hot and cold, depending on the user's needs and the environmental conditions when using it. In most cases, outdoor whirlpool spa tubs are operated using hot water. Hot water whirlpool spa tubs use a built-in heating system to heat water to a suitable temperature, usually between 37°C and 40°C.