Ok to start with, heres a little bit of interesting data that makes it all make sense.
Water is the most abundant substance on Earth yet it is rarely found in its purest state. This is because water has the capacity to dissolve many minerals and nutrients, that are essential for life. However, different industries require pure water that is demineralized and free of all contaminants to carry out many different processes. A Water Fed Pole (WFP) is a long extendable pole with a specially designed brush head that utilises this treated water to clean glass and leave ZERO spots or residue. Much different to spraying the glass with your garden hose. Much, MUCH different...This water is even more pure than drinking water!
What is Pure Water?
Water that has been through a process whereby all substances including minerals, nutrients, bacteria, and contaminants have been eliminated is referred to as pure water. In its purest form, pure water is not recommended for consumption, as it is meant for use in an array of different institutional applications including pharmaceuticals, food and drink manufacturing, and auto cooling systems, just to name a few. We use a special resin (fine beads about the size of sand) to act like a magnet to all impurities-the beads are electrically charged like a magnet (they actually use this stuff for a lot of things, including nuclear waste clean up!).
In this way, the water is instantly produced pure. We have a little meter which constantly tells us the volume of contaminants in the water at the brush.
This De-Ionized water is often used as battery water and coolant for motors or in our case, to clean and rinse windows-and in this way it can be left to air dry, leaving NO spots if the technique is also correct.