I have one that is still running after 10 years, and is have heard of them only lasting a few months it depends on how hard your water is. Also if it is very cold where you are that slows down your output substantially. Steve -----Original Message----- From: owner-apisto@admin.listbox.com [mailto:owner-apisto@admin.listbox.com] On Behalf Of Szalies Jean-Marc Sent: Monday, February 03, 2003 3:04 AM To: 'apisto@listbox.com' Subject: RO membranes How often do you have to change your membranes ? How do you notice they are dead ? I currrently higly suspect mine...(TFM36) Produce twice less / day and seems to reject more then before. It's 1.5 years old, protected by 2 big prefilters. Tap water is ±850µS, eluate ±35µS Is there a way to "revamp" them ? Even only for few weeks ? It doesn't look possible to operate it 'reversed' :( ************************************************************************ ** This e-mail and any attachments thereto may contain information which is confidential and/or protected by intellectual property rights and are intended for the sole use of the recipient(s) named above.Any use of the information contained herein (including, but not limited to, total or partial reproduction, communication or distribution in any form) by persons other than the designated recipient(s) is prohibited.Any liability for the correct and complete transmission of the information or for any delay or interruption of the transmission or for damages arising from the use of reliance of the information shall be disclaimed.If you have received this e-mail in error, please notify the sender either by telephone or by e-mail and delete the material from any computer. Thank you for your cooperation ************************************************************************ ** ------------------------------------------------------------------------ - 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 ------------------------------------------------------------------------- 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