Are you sure you are not exceeding your systems maximum output capacity? If the water runs too fast through the resin it will cause channelling, which will markedly reduce exchange capacity. Just an idea, Alain Savard, B.Sc. Chemical Process Analyst CAE Electronics Ltd. e-mail: [log in to unmask] -----Original Message----- From: Wallisch, Ernst [mailto:[log in to unmask]] Sent: July 13, 2000 11:06 AM To: [log in to unmask] Subject: [TN] Question on D.I. system fouling Hello Technetters, I am using OA paste and subsequently cleaning the CCAs in an inline cleaner using strait D.I. water. We have been using this process for about 5 years. In the past year we have suddenly experienced fouling of our D.I. water treatment system (on two separate occasions), requiring system rebedding (not just regeneration). The D.I. water treatment system consists of particulate filters, carbon bed, chelate bed, cation, anion & mixed beds. It is a closed loop system. The system is fed (due to vapour loss in cleaner's exhaust ) by a separate D.I. system, which in turn is fed by city water. This system does not get fouled up. An analysis on the anion bed from the cleaner's water treatment system resulted in the following: aluminum 65ppm iron 24 ppm sulphur 4200 ppm We have never had ppm counts like these! If anyone could shed some light on the reason(s) for the bed fouling, it would be greatly appreciated. Thank you, Ernst Wallisch Manufacturing Engineer Computing Devices Canada (Ottawa, Ontario, Canada) (613) 596-7536 ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ############################################################## ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ##############################################################