Legionella enters the body mainly by inhaling aerosols (mist) containing bacteria. In an exterior hot tub, when the water is stirred, a large amount of water mist is produced, and people may inhale these bacteria during breathing. If there are too many Legionella in the hot tub water, inhalation may cause Legionnaires' disease.

In the Balboa hot tub system, SLP is the abbreviation for "Sleep Mode". This is an operating mode in the Balboa hot tub control system that is designed to save energy and reduce operating costs by reducing the time and frequency of the heater working.

In the outdoor spas and hot tubs, human sweat, skin care products, cosmetics, shampoo and other organic matter will enter the water with the bath. Over time, these organic substances will form a sticky film on the surface of the bathtub, which will cause discomfort.

Polyurethane foam is one of the most common hot tub insulation materials on the market. It is favored for its excellent insulation performance and wide application. The closed-cell structure of polyurethane foam effectively reduces the loss of heat from the exterior hot tub through convection and heat conduction, so it can significantly reduce energy consumption.

Untreated rainwater directly entering the outdoor jacuzzi hot tub may cause some potential problems. The reasons have to do with the chemical composition of rainwater, air pollution, and its potential impact on jacuzzi hot tub equipment.

The spa hot tub occupies a limited area and has a large concentration of weight. If the deck has a load-bearing capacity of 500 kg per square meter, and the spa hot tub occupies 2 square meters and weighs more than 1,000 kg, the deck may not be able to bear it.