WINDOW CLEANING & WORKING AT HEIGHT Going Pure
Cleaning with pure water gives better results in less time, says UNGER Global.
Cleaning with pure water has experienced a real boom in recent years. More and more commercial window cleaners are recognising the advantages of this innovative method. It’s a simple process with convincing advantages for the commercial cleaning trade.
From tap water to pure water
Depending on the supply area, our tap water contains different minerals. The composition and quantity of the minerals determine its degree of hardness. Decisive for the classification are above all cations (calcium, magnesium, sodium) and anions (carbonate, hydrogen carbonate), which, for example, lead to limescale marks and streaks on the glass when cleaning windows. These water components are expressed in TDS (Total Dissolved Solids) and measured in ppm (parts per million).
Pure water, on the other hand, is water in pure form that has been 100% demineralised by physical processing. The TDS value of pure water is 0ppm. For purification with pure water, TDS values of 0-10ppm are required. A higher purity is not necessary.
Mobile water treatment
Basically, different processes are available for demineralisation. The recognised methods for producing pure water for glass cleaning include deionisation (DI) and reverse osmosis (RO).
In deionisation, the water flows over mixed bed resin which binds the dissolved salts. Deionisation removes 100% of the dissolved salts and produces high quality water. All the filtered water can be used for the purification process. DI filters have a relatively low initial investment and are designed for mobile use on the road. What is required is a normal water connection for the supply hose. Depending on requirements, only the resin bags need to be changed.
Ideal are devices that are equipped with a TDS meter so that the water quality can be checked on site at any time. In the field of window cleaning, for example, the resin should be replaced from a value of 10ppm. DI systems are suitable for periodic, low production volumes of clean water and/or incoming water with a medium or soft water hardness.
In reverse osmosis (RO), the water is pumped at high pressure through a high-performance membrane, ideally after pre-filtering, which filters out up to 98% of dissolved minerals and impurities. In the process, the water flow is divided into waste water (concentrate) and pure water. Good devices direct the pure water to a DI filter, which removes the remaining minerals from the water with ion exchange resin.
50 | TOMORROW'S CLEANING
The result is 100% pure water for immediate mobile use on the road. However, electric power is needed for the pump. Reverse osmosis units are suitable for constant, high production quantities of pure water and/or for hard water qualities. The initial investment is higher than for DI units, but the running costs are lower.
Optimum results with a system
The main advantages of the pure water method for glass cleaning are considerable time and cost savings, as well as the saving of environmentally harmful chemicals in the water. Pure water cleaning works optimally with the right accessories and a little background knowledge. For example, special water-fed carbon telescopic poles allow for safe window cleaning.
A pure water cleaning system also includes a water-fed brush. Depending on the size of the glass surface and the degree of soiling, users can choose between different brush variants. The choice of device should always be adapted to the individual duration of use. Consultation with a specialist dealer is recommended here.
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