Membranes that could be damaged by chloramines should have a carbon phase before the membrane itself. I don't think that the membrane should have much trouble if the filter has prefilters that are changed on a reasonable schedule, but it's hard to know what's in everyone's tap water. Some membranes are fine with chlorine (the actual chemical that damages other membranes). I think that most of those are made with TFC, but I am forgetting my acronyms. What membrane is in your system?
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Jonathan Bertoni
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