Coway WJCC-03 Antibacterial Ceramic Water Filter. Coway WJCC-03 Antibacterial Ceramic Water Filter The installs in the water cooler reservoir to prevent the growth of bacteria in your filtered drinking water. The ceramic balls inside the filter contain silver which is known to prevent the growth of bacteria. It is recommended that you replace the WJCC-03 yearly. Prevents the growth of bacteria in your reservoir Filter Media: ceramic with silver Should be replaced every 12 months Certified by WQA to NSF/ANSI Standard 42 Also known as WJCC-02 Coway Coway P-07QL Countertop RO System Replacement Filters