Demineralized water is completely pure water, devoid of all minerals. The amount of substances in the water can be tested with the TDS (total dissolved solids) meter. Its purity level is given in PPM (parts per million). If PPM is 0, the water is completely demineralized. Fully purified water provides fantastic results when cleaning windows and facades – it reduces electrostaticity, cleans well without chemicals, leaves no streaks and stains after evaporation. The Water Fed technology is used to wash glazing, photovoltaic panels, advertising pylons, blinds, metal structures and smooth facades up to a height of 24 meters.
The complete system for washing with demineralized water (Water Fed) consists of a water demineralization device, a telescopic pole usually made of carbon fiber and a brush with soft bristles. Everything is connected to each other by hoses. Two things are important to achieve the perfect cleaning result:
There are two types of filter systems:
DI (deionisation) – filtration takes place by flowing water through a tank filled with deionization resin. The resin wears out and is replaced with a new one. This solution works best in areas with low PPM value and when the system is used less frequently.
RO (reverse osmosis) – the main filtration is done through the reverse osmosis process. The membrane, which is the most important tool of this system, is preceded by prefilters that protect it against excessive and too quick wear. The deionization tank or filter is at the end of the system and purifies the water leaving the membrane from ~ 15 PPM to 0 PPM.
Table comparing the cost of operating the RO/DI system (Reos ONE) and the DI system: