Ultra Sterasyl is one of the best-selling ceramic water filter for gravity water filter systems. Its combination of a microfilter ceramic outer, granular activated carbon, and heavy metal removal media effectively removes a range of contaminants, including bacteria, chlorine, microplastics, trace organics, enhanced organics, pharmaceuticals, and heavy metals such as lead. The British Berkefeld gravity water filters work beautifully with all Berkey models and are compatible with all other gravity-fed water filter systems on the market.