Generally, at least 24 hours should be waited after a chlorine shock, and testing should be conducted to ensure that the free chlorine concentration has returned to a safe range of 1–3 ppm (parts per million) before entering the Swim spa tub.

Chlorine is the most common disinfectant used in pools and spas, but its healthiness in swim spa tubs depends on how it is used. • Strong bactericidal power: Effectively kills most bacteria, viruses, and algae; • Low cost: Economical, practical, and easy to purchase.

Turbidity in the swim spa tub is one of the most direct signs. Aggregation of bacteria and microorganisms, and redispersement of suspended matter, make the water appear unclear. Especially noteworthy is persistent turbidity rather than turbidity caused by short-term agitation.

In fact, bacterial growth is one of the most serious consequences of not changing the water for a long time. The temperature in a swim spa tub is usually between 30–38°C, a temperature range that is the ideal growth environment for most bacteria.

Jacuzzi tubs primarily focus on "relaxing the body and relieving stress." Swim spa tubs, on the other hand, have a more comprehensive design philosophy. They not only provide hydro-massage functions similar to jacuzzi tubs but also feature "constant-temperature swimming training."

"Excessive shock" in a swim spa tub generally refers to the water being subjected to excessively strong, frequent, or uneven dynamic forces. These shocks disrupt the stability of the water, causing suspended solids and chemical particles to redisperse, potentially leading to turbidity.