John, Careful there. DI water "wants" to ionize itself and will grab available ions from places where they should be left. Peter C ==== At 09:29 AM 7/13/2007, John Gillis wrote: >Thanks all for the sound advice, I have deionised water on tap (no pun >inteded) >in my lab so will bring it home in 2 litres at a time on the bike. >John