Which of the following is a critical factor in maintaining pool hygiene?

Maintaining pool hygiene is essential for ensuring a safe and enjoyable swimming environment. Regularly scheduled water turnover is a critical factor because it refers to the process of filtering and circulating the pool water, which helps to remove contaminants, debris, and pathogens that can pose health risks to swimmers. When water is turned over regularly, it allows the pool's filtration system to effectively clean the water, thereby reducing the likelihood of problems such as algae growth, cloudy water, and the presence of harmful chemicals.

In contrast, while weekly staff meetings may help in planning and coordination of pool maintenance, they do not directly impact the hygiene of the pool water. Decorative tiles and frequent painting of pool surfaces might contribute to the pool's aesthetic appeal but do not address the essential aspects of water cleanliness and safety. Therefore, regular water turnover stands out as the key practice directly related to maintaining optimal pool hygiene.