[Miko67]

How many houses can you clean at a time using a full backpack?

[SeanK]

Your talking between 15 and 20litres of water per the average semi more if its a first clean or starting out.
If your using a backpack then to pole the tops and trad the bottoms would be your best option.

[Smurf]

All depends on the size of the property, how much pure water the backpack can carry, how dirty the windows are, what flow rate you use and if you use some sort of tap to turn the water on/off.

If you are thinking of getting one to start getting into wfp from my experience I soon found out working with a pf trolley and having to hump water about done my head in.

[Miko67]

Say average a semi detached ?
Windows bn cleaned trad for years , so are clean.

[Cookie]

For me one backpack of water would last for only one average semi detached house on a maintenance clean.

[Steven Biggs]

I can easily get 2 semis sometimes 3  on 4 weekly jobs . 22 litre backpack .

[Smurf]

I prefer to use a van mount on high flow rate and crack them out now instead of messing about with a trolley/backpack on a lower flow rate ( trying to save water) that use to take me so much longer to do.

[Steven Biggs]

Yeh decent flow rate with the van mount is always better . But when I use the backpack I always have it on full , and it's a good flow . I wil easily do 2 semis with 22 litres . I don't have a problem using it for a couple hours a day , it's sometimes a nice Change . It's gotta be on a sack truck tho . Couldn't do with carrying it or humping barrels .

[sunshine windows]

I would have said 1, maybe 2 if you're extremely efficient

[Shane sharples]

I took a custy of a tradder , you think they are clean but once you start running water on them and all the dirt won't stop coming from between the window and window sill you'll be surprised how much water you use! after they are upto scratch depending on size of semi (bay windows?) I could do 2 semis with 25 Ltrs

[Smurf]

First cleans for me use to be a nightmare using a wfp trolley as I could get through at least 150 ltrs of pure if not more on bay window type semi's by the time I washed years of crud of all the plastics including gutters, fascias, soffits on 3 sides. That's before cleaning the windows & doors 

I felt knackered having to hump all those containers about just for one job and I'm sure if I had carried on me knuckles would be scraping along the floor by now

[Micky Barber]

Me and missus use a 22 litre backpack each and nothing else no problems at all, no need for 100 meter reels got 30 metres on one sack truck and about 12 metres coiled up on a small Ikea sack truck.

[dazmond]

i clean 4 cottages(3 of them tops only/i trad the ground floor windows)on a canal bank with one fill of my backpack(19 litres)....just. .these are 4 weekly so not that dirty.