What factor can affect the chemical balance of pool water?

The chemical balance of pool water is significantly influenced by heavy rainfall and pool usage due to the way these factors introduce various substances into the pool environment. When it rains heavily, rainwater can alter the pH and alkalinity levels in the pool, often bringing in contaminants and diluting the pool’s chemical concentrations. Additionally, when the pool is used frequently, swimmers introduce organic materials like sweat, sunscreen, and oils into the water, which can disrupt the chemical balance. High usage may also lead to a higher demand for chlorine or other sanitizing agents to maintain water quality.

In contrast, while wind direction might affect debris or temperature variations, it does not have a direct impact on the chemical composition of the water. The time of day can influence factors like evaporation and temperature, but it does not inherently change water chemistry. The type of pool furniture might affect the overall aesthetics or comfort but does not play a role in the chemical dynamics of the water itself.