FTP-815 UF Filter retains the mineral trace elements which are beneficial to human body, and then use the advantages of KDF and activated carbon to effectively inhibit the growth of bacteria and fungi in water and remove discoloration and odor, so as to ensure that the filtered water can be used safely and healthily..It has four stages filter include:PP cotton,Pre-carbon filter(C1),Rear-carbon filter (C2),and Ultra filter.