What is an accurate statement about sanitizer checks?

• A. Rely on appearance to judge concentration.
• B. Use any sanitizer ignoring the ratio guidance.
• C. Check concentration only if there is a problem.
• D. Verify sanitizer concentration with test strips or a test method, and adjust to the specified ratio.

Answer: (D)

Measuring sanitizer concentration with a test method is essential. Use test strips or a validated test to determine the current strength, compare it to the specified ratio, and adjust the mix until it matches. This ensures the solution is strong enough to sanitize effectively without being over-diluted or overly concentrated, which can cause residue or damage. Appearance cannot reliably indicate concentration, and relying on it or skipping checks until a problem arises increases the risk of under- or over-sanitization. Regular testing, especially when mixing fresh sanitizer, keeps performance within the required standards.