... and PP sediment membranes filter as Pre-filter which can wipe suspending particles,dust,particles,organic chemicals,unpleasant taste,chlorine ... water complies with RO inlet requirement. Then RO filter can wipe dissolvable substance,bacteria,pesticide ,heavy metal particlea as well ... as the carcinogen like chloroform,fluorin etc which can not be wiped out by normal treament methods.Material: ...