Which of the following should be recorded in daily records?

Recording free available chlorine residuals and total chlorine residuals in daily records is essential for maintaining water quality and safety in aquatic facilities. These measurements are critical for ensuring that the pool water is properly sanitized and safe for swimmers. Monitoring chlorine levels helps to prevent the growth of harmful microorganisms, which can lead to health risks for pool users. By documenting these residuals daily, staff can quickly identify trends or issues in water quality, facilitating timely interventions if levels fall outside acceptable ranges.

Other aspects, such as the total chemical costs or memos from supervisors, while important, do not directly impact the day-to-day operational health and safety of the aquatic environment. The type of pool equipment used, while relevant for maintenance and operational knowledge, also does not pertain to daily health and safety monitoring in the same way that chlorine levels do. Hence, focusing on chlorine residuals is crucial for effective aquatic management.