when i first took over some commercial work , we had some 2nd storey work, didnt have the ladders for that height and i didnt fancy the height anyways
so we used a hand pumped back pack, it worked well enough, at 2nd storey though with the long poll, we had 1 pump and the other pole
i have a house that has 2 windows that are right the way around the rear of the house and up 200 odd steps, i still just grab the pump and take the pole and that up, if you have a little tap on the pole, close the tap, pump till you cannot pump anymore ( its about 8 pumps on mine ) then grab the pole and open the tap so water comes out, i can get 2 windows done on 1 set of pumps
it works ok to be honest