How long do British Berkefeld® filters last?
Each filter has a service life of 1500 litres, so each pair has a service life of 3000 litres.
As explained on this page, NSF certification requires filters to be tested on twice their capacity, which gives a significant margin in terms of service life.
Nevertheless, to ensure optimum performance, we recommend changing the filters after 6 months to a year, depending on how they are used.