Each Black Berkey® water filter is designed to filter and purify approximately 11,350 liters of water before needing replacement. The pair of elements that equips all Berkey® systems (except the Go Berkey®, which has only one) will filter and purify about 22,700 liters of water before needing to be changed.

This equates to about 10 years of use for two Black Berkey® filters in a system serving a family of four, each consuming 1.5 liters of water per day.

Example calculation to determine when to change the filters in a Big Berkey® system:

The Big Berkey® has a capacity of 8.5 liters. If the system is fully filled once a day, the calculation will be as follows: 22700 / 8.5 / 365 = 7.3 years

This formula can be adjusted according to your model and daily filling habits to determine how often you will need to change your filters.

Important note: The theoretical lifespan may vary depending on the water you filter. Not all water is equally loaded with contaminants. Therefore, this theoretical lifespan is not universal and depends entirely on the composition of each type of water and the maintenance given to the filters.

You can also apply this formula to PF-2 filters based on their theoretical filtration capacity of 3,800 liters.