regarding the comments on ro being oversold and the deletion: some of these statements are common facts among ro users: ro does not remove bacteria; before going thru an ro membrane water must be pre-treated.  would such comments need citations?  as for neutrality, the ph level of the comments may need to be tested - ro isn't for everyone and i have one.  in addition, the section on the effects of chlorine on the 2 types of ro membranes seems to state that chlorine damages both types but i am a little confused.  you've deleted some important information - someone might like to be tipped off that they may need to buy a water softener and 3 or 4 filters and an electric pump to use a small under the sink reverse osmosis unit to supply the water for their refrigerator dispenser and ice maker.    jm