6 stroreys
That has to be about 60ft..or at the very least 50ft.
That is a big pole, others that work at that height will be better informed than me, but either a fibreglass or aluminium pole isn't going to be man enough...or at least I wouldn't think so.
I have the Unger poles and they will extend to 42 ft, and today I have one account (that I will do presently is the rain has eased) where I need all sections of the pole extended, I guess at full stretch on one or two windows I will be cleaning glass about 45-48ft up, and that is bloody hard work, at that height the pole will bend like a soft banana.
your packback will get the water up to that height, presumably you have either a 60psi or 100psi pump and whicher one you have it will pump the water as high as any van mount system, it is still a 12 volt battery powering the identical pump, so you will have no worries on that count.
But I really do hope you have jacked the price right up there, and I really do mean right up there.
If you are only charging, say, 75p for a downstairs window, for every floor you go up you should be charging a further 50-75p on top, so by the time you get to a 6th floor window you are charging as much as £4 or £5 per window.
It is a physical impossibility to clean these windows off a ladder, prior to WFP they would haveto have been cleaned off a platform of some description.
Also, at that height with WFP, each window will take you 3 or 4 times as long to clean.
you will be forced to work at a much slower rate, you level of control is markedly reduced.
And no way attempt to clean in it in anything other than ideal weather conditions either!
if the wind catches it, the pole will be gone
The poles that are designed to be used at that kind of height are very expensive too!!
Ian