A customer of mine in a machine shop bought one of these because of the hard water problems he was having in his coolant sumps.
Get a spot-free car wash every time with our Portable Water Deionizer. Eliminate water spots and save time with ion-exchange resin technology.
www.griotsgarage.com
I was impressed and have terribly hard water at home so bought one for washing my vehicles and couldn't be happier. My TDS (total dissolved solids) were over 400! I wash as normal, fog using a spray wax, then rinse with the deionized water. Sometimes I'll blow dry with my leaf blower and towel dry but the water spot problems are almost non-existent. I also got the TDS meter and water coming out measures zero. I also quit buying black vehicles