When sanitizing the shake spindle, how full should the cleaning tumbler be filled with sanitizer solution?

The correct choice indicates that the cleaning tumbler should be filled with sanitizer solution to three-quarters full. This level is optimal because it ensures that there is enough solution to effectively submerge the parts of the shake spindle that require sanitization. Adequate surface coverage is essential in order to achieve thorough disinfection, as it allows the sanitizer to come into contact with all surfaces of the spindle.

When the tumbler is filled to this level, it helps to maintain the necessary concentration of the sanitizer, preventing any dilution that could occur with a lower fill level. A three-quarters full tumbler also mitigates the risk of overflow and spillage during the cleaning process, which can happen if the tumbler is overfilled.

While alternative levels of filling could be considered, such as half or full, they do not provide the balance of sanitization efficacy and practicality that three-quarters full offers. This understanding of the proper fill level is crucial for ensuring that the cleaning process is efficient and effective in maintaining hygiene standards.