Wow i am totally amazed how much water you people use per house.
In van i have 500 litres and in 2 years i have only emptied it twice and thats when ive taken over a round from trad to wfp, so constant new cleans.
I clean a huge farm house which is used as an accountance agency. Tho wife does horse riding shows etc so still have horse n stabled. But part of the stables is the break room for all the staff. There also have a ground floor block of offices so four large windows and two doors and also a granny house which they rent out, slightly bigger than a basic 3 bed semi. The farm house has a huge conservatory as well.
Its quicker for me to use the trolley than drag all the hose out dodging everyones cars and foot traffic etc etc. I clean all the glass on just 2 fills of the trolley but i dont drain the 2nd fill. So probably use about 40litres of water. Again this is water flowing on agitation and rinsing. The only water reserving is using tap valve turning on/off between each window thats all. But it is regualr 4wk maintenance cleans.
On say a normal council estate size house, 3 bed semi would you still use 20 // 25ltrs per house. Just using this as to relate to the size of house everyone has in mind when cleaning, because i cant believe how much everyone is saying they use.
When using van system i work with hot fast flowing water on a pure freedom digi controller set at 80 and 4 pencil jets. But i find a fast flow on maintenance cleans uses less water because your kinda rinsing whilst your cleaning.