The water filters have different kinds,which are made from different materials, Such as spun PP filter cartridge, PP string wound nound filter cartridge, pleated cellulose filter cartridge, carbon block cartridge, granular carbon filter cartridge, resin filter cartridge, ceramic filter cartridge and so on. Among those cartridges, CTO filter cartridge is made from coconut shell bossed, palm or nut shell based &coal based carbons.water filter cartridges are disposable items that fit inside Liff housings. These cartridges are used to filter out undesirable elements from drinking water