I have started using WFP for just the upstairs windows, due to the fact I keep running out of water, and waste 30-40 mins going home to fill up.What do you do and why?
Lee
what size tank do you have lee? and how long does it last you
250l and 3 x 25l jerry cans...lasts til just after lunchtime 
Lee
How many houses do you clean in a morning because you are using 325 litres, which most cleaners find will last for 1 1/2 or 2 days
Probably about 7, this seems like not nearly enough out of this amount of water, so i'm gonna play with the flow controller,and try and install a trigger this weekend. Still learning too, but want to get it sorted as it's costing me time and money 
Lee
Unless the 7 houses are mansions then I would say you are using too much water, for instance on a first clean I might use 25 litres, then when they are pristine I would use about 10 litres.
So with the amount of water that you are using I would clean 13 new and dirty houses or 32 houses and 1 bungelow.
I do not have a flow controller or trigger and the pump is a 100psi one, so you might be over washing.
Poll