Low pressure performs ideally with a waterpole, because the goal is not “pressure washing” but merely agitating and rinsing away debris on windows. You need only high enough pressure to push the water up the pole, though the brush jets, and onto the window to rinse it. The brush and the reaction of the Pure Water absorbing particles are what clean the window.
Using a waterpole correctly with a brush and low pressure Pure Water leaves behind no minerals to create water stains.
Most taps can produce pressure sufficient to operate a single pole up to 30 feet or 3 stories in height (about 40 psi). Some water pressure is lost in the filter process and some through the waste water (the minerals or TDS) expelled by the filters, but this usually leaves a sufficient amount of pressure to clean effectively.
Reaching higher, running multiple poles, or some cases of very low tap water pressure may require the additional help of a water pump.
So while many window cleaners working with smaller residential customers may not need the assistance of a water pump, it may become necessary for window cleaners running multiple poles and working on taller, commercial buildings.
Water pumps are most often used between the tap and the filter system. This gives an extra push to water as it goes through the filters and may actually extend filter life. It also results in a stronger pressure at the end of the pole, where it is needed most.
Pumps may be battery operated or plug-in and usually push 100 psi or about 5 gallons per minute.
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