Water Quality ( a simplified overview)
Reach & Wash System wash windows etc by water fed brush and negate the need to squeegee off by utilising pure water. This means that after washing / rinsing, the window may be left to dry naturally because any particulate content, (i.e. dirt , silt, calcium etc.)has been removed, therefore the window should dry clear of spotting or streaking. Purification can be achieved by different methods or combinations of these methods The simplest form of purification is De - Ionisation The resins within this filter "attract"contaminant particles very efficiently, leaving water 99.9 +% pure. Like any other filter, the dirtier / harder the water going in, the shorter the useable life span of the filtration device.
Water Quality varies from Under 40 ppm (parts per million) in large areas of Scotland, to over 400ppm in extensive areas of South/East of England. ( The higher the ppm figure, the "harder" the water).
The second method of purification is by Reverse Osmosis
In simplified terms, water is passed over a very fine membrane at pressure. some of the water, (maybe as little as 25%) will pass through the membrane leaving 98% or so of particles behind.The rest of the water will go to drain taking the contaminants with it.The membrane life is much shortened by calcium and lime in hard water areas and a softener may need to be used first to extend RO membrane life.
The treated water is about 98% pure and a DI filter is then used to bring purity to 99.9+%
RO is a slower, more complicated and initially expensive method to purify, but is necessary where hardness and water volume usage is medium/ high.
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