its best to use distilled over tap... but redline is still much better down the road.
i was doing some corrosion tests a while back... and they are still sitting there. as soon as i get a DigiCam again i will take pics (any day)
anyway. the tests were copper and aluminum in a bunch of test cups... distilled water showed green oxidation forming after a while in the distilled water... the redline is still perfect =)
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