At Coldstream, they research, develop and manufacture a range of high-quality yet affordable ceramic water filter cartridges. They have been manufactured in the United Kingdom since 2013 and have sold millions of our filters worldwide, resulting in healthy, safe and great-tasting drinking water. These ceramic filters are compatible with many brands of gravity-fed water filter systems (including Berkey, British Berkefeld, ProOne, Phoenix, Monderma, Boroux, Pure Filters and Newton). They are easy to install without any additional preparation.