I have been using a backpack on a maplin trolly for a year now working 6 days a week, have now installed a 500l tank etc and went out with it this week my life has been transfomed. How I have done the year with a backpack I dont know. It feels so much easier now on the first day my output has gone through the roof, seem to be using more water but I dont mind it all feels so much more professional. Thanks to everyone on this forum for all your advice and comments