I know a simialr thread went around a year or two ago and the result was plasticizer leeching out of the tubing and fogging.
I use only distilled water and get the fogging in a matter of days with 3603. Even if I simply place a pices of 3603 in a glass of distilled water, it fogs.
Many people tried the other variants of Tygon without plasticizer, but they were very stiff and made the tight turns difficult for our application.
Edit: here is the thread:
http://www.xtremesystems.org/forums/...ht=plasticizer



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