Final answer:
The IBWA code of practice mandates weekly testing for total coliforms in finished product samples to ensure the microbial safety of bottled water, using standardized tests to detect potential contamination.
Step-by-step explanation:
The IBWA code of practice requires weekly testing for total coliform in finished product samples. Coliforms are a group of bacteria predominantly inhabiting the intestines of warm-blooded animals and are considered an indicator of potential contamination. Total coliform testing is crucial for ensuring the safety and quality of bottled water as outlined by the International Bottled Water Association (IBWA). This testing involves analyzing water samples for the presence of coliform bacteria, which, if detected, indicate potential contamination by fecal matter or other pathogens.
The testing protocol typically includes multiple stages of examining varying volumes of a water sample to determine the presence and level of coliforms. A color change in lactose broth tubes, from red to yellow, signals coliform growth, thanks to lactose fermentation altering the pH. Using such standardized tests, manufacturers affirm that their bottled water products are consistently safe for public consumption and meet the IBWA and regulatory standards for microbial safety.