heres one for all you car detailers

These are supposed to be a real good bit of kit if you live in an area where water is hard.

Supposedly you can wash a black car in direct sunlight and leave it to drip dry and will leave next to no water marks or smears (even on glass), someone posted about them on gtr oc and people are raving about them being a must have bit of kit for anyone who's a detailer or just wants less work when washing their car

http://www.vyair.com/scripts/prodView.asp?idproduct=88

So in a short its a water softner ??? It doesnt say to much on the website ....