I've had the British Berkfeld Big Berky stainless since the 90's. My original filters are still used. I bought spare black/white filters from England a few years ago, but haven't needed them yet. I really need nothing else. Best investment ever. Bought my Berky at a gun show.We've had a large Berkey for years and we're still on the first set of filters. No matter where we travel, the water tastes the same. Worth every cent we paid.