Hi due to purchase of ro system, I now have my di unit complete with hoses and 60l pressurised tank.Easy to use just connect to outdoor tap and it produces instantly. The water passes thro di resin and stores in tank pressurising system until you open the valve.Would like £300 for it and can deliver upto 1 hour drive from lutonCall me on 0772 338 4092 if interested (Darren)The di resin does need changing costs around £80The trolley can be found on the site below just copy and paste as i cant seem to add the picture of mine but it is the same less than 6 months oldhttp://www.reachandclean.co.uk/window_cleaning_trolley_system.htm