Right Steve here we go
My RO is a Merlin,it is connected from mains water my tap tds is 315 and the Merlin brings it down to 28 then it goes into the black tank (on pic) and then when i need water ready for my containers and van tank i pump it through my 29 litre resin cylinder using a 240v Flojet 60 psi pump and comes out 00
My water containers are just placed on the trolley and i use a length of plastic pipe pushed right down to the bottom and then use a length of hose from pipe to pump connected with hozelock connector,then if i need to put my 60 litre tank on i adjust the hight of the trolley and lay it down and put tank on and a similar method is used for pump connection like on the smaller container
i don`t know if you haven`t noticed where my pump is with you asking how water is pumped from tank to pole and brush if you look at the pics its between the handles on the trolley,
i hope you understand all of this and it`s been of any use,cheers,Gaz