NorthStar, Chris' units do the whole house, so that would cover your shower. They look similar to Utopic Water units, but don't know if they work the same way.
Chris, I wonder if your units produce permanently structured water? And for what distance from the unit will the water be structured? You might like to find someone with a GDV unit to test your water.
Utopic water units permanently structure the water and.. maybe I need to understand something more here, but they recommend that if you have a big house or pipes further than 300 feet, that you get a unit per 300 feet (of distance from the unit I believe).
http://utopicwater.com/
Amy, I know Clayton Nolte (of Utopic Water) addresses the issue of the single atom in one of the interviews. If I run across that I will post it here.
Clayton worked 40 years for the defense department studying nature and how to duplicate some of it, and his water units are a result of that. He is working now to duplicate some of the proof outside of that world as he couldn't take the research with him when he left.