The filter's lifespan varies depending on the source water and the level of contamination. The recommendation for when to replace the filter depends on several factors. For example, when filtering chlorine, the filters last for more than 45,000 liters per pair. However, there are various contaminants in the water, and their concentrations can vary.
The Black Berkey filters are designed to last for many years. However, we now live in a different time than we did a few years ago. The number of contaminants has only increased, and they have become increasingly severe (think, for example, of PFAS or the significant rise in pharmaceutical residues, pesticides, etc.). This has a huge impact on the filters, meaning they need to be replaced a bit sooner. Of course, it’s difficult to keep track of exactly what’s in the water and in what quantities, which is why we recommend replacing Black Berkey filters every 3 years at most when using tap water. If you use water from another source, we recommend replacing them sooner.