Generally, commonly used chemicals in spa jacuzzi tubs mainly include the following categories: • Disinfectants (such as chlorine or bromine) • Shock treatment agents (high-concentration oxidants) • pH adjusters • Alkalinity adjusters

Because the pH of the swim spa tub rises slightly during the day due to heating, agitation, and aeration, adding chlorine at night when the water temperature drops and the pH stabilizes allows for a higher proportion of hypochlorous acid, resulting in better sterilization.

Even if the swim spa tub is not used for extended periods, the filter should still be run periodically or kept in low-speed circulation mode. Many users worry that continuous filter operation will result in high energy consumption. In fact, actual power consumption depends on the pump's power and operating mode.

Considering industry standards, design structure, ergonomics, and water capacity, we can arrive at a clear answer: a standard 4-person hot tub is generally suitable with a capacity between 700 and 900 liters, and internal dimensions of 180–200 cm in diameter or length and width.

The filter should be turned on when adding chlorine to a swim spa tub. This is because the operation of the filtration system helps distribute chlorine evenly throughout the water, ensuring that the disinfectant fully contacts every part of the water surface and pipes.

The primary use of a vacuum cleaner in cleaning a swim spa tub is to remove bottom sediment. While most swim spa tubs have built-in HEPA filters, these systems mainly target floating debris in the water and are often ineffective against sand, leaves, hair, and fine dust deposited at the bottom.