household pre-filtration 5-stages purification PP filter,CTO,UDF,RO,T33 white water purifiers food grade materials 5 stages filter ... cartridge:1. PP filter, PP-10:removing particles,sand,dust,colloid and so on.2.Granular ... ,odor, etc.3.Block Carbon Filter(CTO-10):removing chlorine,odor,suspension.4.RO membrane:removing virus,bacterias,harmful soluble solid,etc ...