What happens if I use my Black Berkey™ Purification Elements after 23,000 liters ?

We determine the typical lifespan of the Black Berkey™ Purification Elements by their ability to reduce heavy metals. The breakthrough of heavy minerals can occur at about 23,000 liters. Heavy metals can leach through beyond 23,000 liters. However, the elements can be used  beyond that point because other reductions continue well beyond 23,000 liters.