Kathy, Brian has given you the most complete answer. If you can live with up to 10 micro S of conductivity, I would consider using RO. It will be preceded with carbon which will remove most of the organics and the RO most of the ionic contamination. Then, if you need purer water, you can put mixed beds at the end of the RO for very high quality. The mixed bed resins can be rented or bought. The RO will greatly extend the life of the mixed beds. The best combination depends on the quality and quantity of water needed. If you need or use RO elsewhere, you can put small mixed beds at point of use. Gary McCauley -----Original Message----- From: Kathy Kuhlow [mailto:[log in to unmask]] Sent: Friday, March 30, 2001 2:41 PM To: [log in to unmask] Subject: [TN] Water Wash system justification Help..... I have recently been assigned the task of justifing our water wash system. Here is what I know: 1) Spray over Spray Westkleen system 2) For some reason using softened water not DI. The softening is accomplished through sodium addidtives (got me going). What I am expected to do: Determine what is the effectiveness of the process. Justify why DI isn't used and why adding salt to the wash to remove salt is ok. Then determine the water surface tension and content (hardness, contaminates present, etc) TIA KK --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------