Dandan, I don't know what info you're after but if it just basic knowledge then.
I use my poles with a brush attafchment on the end which has two 2mm jets fitted equidistantly between the bristles, the water I use is between 40 to 60 psi at a flow rate of 1.5 to 2 litres per minute (measured this using a jug). WFPoles are virtually useless at pressure washing the dirt off windows and rely upon the agitating action of the brush and the rinsing action of the water to do the job.
I believe some people have attatchments i.e. scraper blades, but I dont and I cant see the point of having a squeegee if you are using pure water, for one it is defeating the object of using pure, why not just use tap water and blade off, and for two if using pure you will find that the rubber blade will not glide over the window the same as when using a detergent in the cleaning water.
Hope this helps with what you needed.
Steve a