Eric, For the water here in central Texas the carbon block pre filter on a RO unit will break the bond between the chlorine and ammonia found in the chloramine, but the feed water still has ammonia left in it and the RO membrane can not remove the ammonia as its molecules are too small. The only solutions are to treat with a ammonia converting chemical such as Prime or Amaquel or keep a seeded bio filter in the storage tank. The waste water will also have ammonia, but will be more toxic at the higher ph. HTH, Tim -----Original Message----- From: owner-apisto@admin.listbox.com [mailto:owner-apisto@admin.listbox.com]On Behalf Of JerrCarol@aol.com Sent: Saturday, September 14, 2002 1:37 PM To: apisto@listbox.com Subject: Re: RO and chlorine Does an RO unit remove chlorine and chloramins (sp?) from the RO unit? I am assuming it does. But does it also remove chlorine and chloramins from the "waste" water? ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@listbox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@listbox.com. apisto-digest@listbox.com also available. Web archives at http://lists.thekrib.com/apisto Trading at http://blox.dropship.org/mailman/listinfo/apisto_trader