:-/:-/would any one know if i bought a backpack, could i remove battery, pump, then add to a 25litre drum instead of buying a trolley system. i am trying to get into wfp cleaning, just trying to save. i know a wfp operator who said he will fill 25lt drums with pure water for £1. untill i learn how to do my own. then just strap onto a trolley. then i can get started to practice on my own:s