So for you, it's only hard to maintain. Put that deionized water in contact with some sort of active metal (like, say...copper? Or aluminium?) and see how long your ion-free solution stays that way.Chazwozel said:Not if you're me and have access to reverse osmosis processed deionized water.
I'm a-tellin' ya. If you want to do it on the cheap, go with mineral oil. If you has (quite) a few bucks to spend, go with Flourinert™.
--Patrick