Thought I'd share with you my results from the tests after running the Pillow for 48hrs.

Well it dropped the GH by about 6 degrees, or roughly 100 ppm.  The KH remained between 3 and 4 degrees. I forgot to check that before adding the pillow, but didn't think this would become an experiment, DOH!  

I believe that my KH is about that anyway, so it didn't seem as if it had changed that variable much.

It performed actually BETTER than what was stated on the package, as far as mineral removal in ppm.

I'm recharging it now, and then I will run another set of tests on GH, KH, and pH before and after.

My pH reading came out at 7.4 after using it which is high for that tank for it usually never budges from 7.0. However, if you were to ask me if I tested the pH beforehand? My answer would have to be No. (Another DOH!!)

Also, whenever I've filtered water with a Brita type filter, the pH always drops, not rises.

So I'm just a bit curious and am asking myself, "What's in this guys?"

I might post this information as a new post when I run the second set of tests, as this thread is getting a little long.

Hope this was some help to someone.
I found it interesting.