Ultra Sterasyl is our best-selling ceramic water filter for gravity water filter systems. The combination of a microfilter ceramic outer shell, granular activated carbon, and heavy metal reduction media effectively reduces a range of contaminants including bacteria, trace organics, enhanced organics, pharmaceuticals, and heavy metals such as lead. Compatible with our gravity water filters as well as other gravity-fed water filter systems on the market.Replace your ceramic water filter every six months for consistently clear, great-tasting, and odor-free water. In areas with cloudy water, the Ultra Sterasyl filter can be cleaned to help restore flow.Replacement ceramic water filter cartridge, complete with wing nuts and washers. - Improves taste and odor - Reduces bacteria, heavy metals, trace organics, enhanced organics, pharmaceuticals, and PFAS - 99.9% reduction of microplastics* - Suitable for use in Berkey, Phoenix, Purewell, and Newton Gravity Water Filter Systems - Replaces the ATC Super Sterasyl ceramic filter - Replace every six months for optimal performance *As tested and certified by NSF to NSF/ANSI Standard 401