The core technology of the whirlpool tub is the water flow system driven by a water pump. The water in the bathtub circulates through the water pump and sprays out from specific nozzles. Unlike the hydromassage of a whirlpool tub, a jacuzzi tub uses a mixture of water and air.

Risks of using a whirlpool hot tub for the elderly: 1. Increased risk of heart disease 2. Excessive acceleration of blood circulation 3. Risk of fainting and falling 4. Joint and muscle problems

A freestanding hot bathtub is a hot tub that can be independently placed indoors or outdoors without relying on wall or other structural support. Unlike traditional embedded or built-in bathtubs, it does not need to be fixed to the wall, ground or specific frame, but can be placed directly on the ground for use.

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"SnS" and "Sn" are two error codes that specifically indicate the status of the Balboa spa hot tub temperature sensor. They inform users of faults related to the temperature sensor in the spa hot tub.

Acrylic spa tub: Acrylic material is one of the most common outdoor spa hot tub materials because it is light, durable and easy to clean. Acrylic spa hot tubs are usually light in weight, and the weight of an empty tub is about 200-300 kg, which is suitable for 2-3 people to carry.