Ho72,
The 5 gallon Nerl water of which you speak looks exactly like what I've been using in my perfection steamer. It works great and I do trust it's purity much more than the distilled water I was using before. I also use it to rince off and clean brushes and vacuum tubes when finished and as the mix for the Disc Doctor fluids. A 5 gallon container lasts months so I think it's worth the extra cost. I use the more expensive reagent grade water for the final vinyl rinces though. This is all working for me very well. YMMV.