Set of 3, Premium Quality Replacement Filter Cartridges for BlueLife Water Purifiers/ Residential Water Puifiers. Sediment Filter Cartridge: 5 micron polypropylene sediment filter cartridge. Pre-Carbon Filter Cartridge: Silver impregnated granular activated carbon, 280 Grams Carbon Used. Post-Carbon Filter Cartridge: Fine granular activated post-carbon filter cartridge, 150 Grams Carbon Used. To be used with BlueLife TulipsRED, NanoSwatch, MetroPLUS, HygienePLUS, NanoHygiene, UltraHygiene, Concepto, NanoDrop models, also with other residential water purifiers subject to the suitable models.