[INCLUDES] (x3) 0.5 Micron coconut shell carbon block filters [HIGH COMPATIBILITY] This filter set is compatible to filter cartridges 4234377, 4234370 [FILTER LIFETIME] Replace filters as needed every 6-12 months (depending on water quality). To ensure you are continuously receiving sediment-free water, change your filters regularly. [Why IPW Industries Inc] IPW Industries Inc has 17 years of expertise and are members of the Water Quality Association. We stand by our products and service.