I was talking to a valeter yesterday and he was offered 200 litres of pure water for £13 recently by a largeish cleaning company that does all sorts inc windows.
I have been wondering: for those who maybe can't afford the outlay at first; wouldn't it be good to be able to just buy the tank, hose, etc and not have to process the water - just buy it like petrol.
I have a flat and no garden which is the main difficulty re water processing. Waiting for the company to get back after I popped in yesterday