Replacement cartridge (filter) for evaCHILL OR evaLIGHT plus OR evaSMART. Consists of nano-fibers made of glass and basalt, making the filter inorganic, which prevents bacteria and fungus (patented). Lifetime approx. 1000 hours, equivalent to 4-5 hours of daily use for 6 months. The service life depends on water quality as well as the amount of dust particles in the room.