The Geopress replacement filters are designed for a service life of 350 cycles (250 litres). The service life is reduced if water with a high proportion of silt, sediment or tannins is cleaned. The cartridge pressing time increases towards the end of the cartridge service life. When the pressing time reaches 25-30 seconds, the cartridge should be replaced. Even if the cycle time increases, the cartridge continues to provide protection. It is advisable to replace the cartridge at some point, despite any environmental concerns.