The pH value of the water directly determines the feel on the skin. • pH too high (>8.0): The water will be alkaline, causing dry skin. • pH too low (<7.0): The water will be acidic, easily irritating the eyes and skin. Maintaining the pH of your swim spa tub between 7.2 and 7.6 is key to achieving a smooth feel.

Many people are accustomed to bringing their usual shower gel, bubble bath, shampoo, or skincare oil directly into the spa jacuzzi tub. In fact, these everyday products can easily cause the following problems: • Excessive foaming and bubbling • Clogged filters and pipes • Affecting the effectiveness of disinfectants

The real source of the roughness: Calcium carbonate deposits The rough feel of a spa hot tub is usually caused by scale buildup. Scale is mainly composed of calcium carbonate (CaCO₃) or magnesium carbonate (MgCO₃), minerals that come from tap water.

Use a low-corrosion, neutral cleaner specifically designed for spa equipment or outdoor furniture, such as: • An environmentally friendly cleaner with a pH between 6 and 8; • A cleaning formula that does not contain chlorine, alcohol, or ammonia; • A biodegradable product that is safe for skin. Such a cleaner will effectively remove dirt without damaging the exterior material.

Low-calcium water lacks protection for metals and is prone to slight acidity. Long-term use will corrode nozzles, pipes, and heating elements. Metal corrosion not only shortens equipment lifespan but can also lead to metal dissolution in the water, affecting water quality safety.

The response of bacteria to temperature is not a simple "live or die" situation, but a gradual process. Below 40°C: Bacteria can still exist actively. 37–40°C is precisely the commonly used temperature range for many spa hot tubs, which means that: Normal operating temperatures cannot kill bacteria.