The water weight is nearly inconsequential. The 66’ of pole and brush is only 10 pounds.
I’ve modified mine so it’s even lighter and stiffer than the stock model. I did a series of tests to observe the degree of stiffness my easy modifications made. It’s actually considerable. Attached are photos of the mod.
I left the hose management system in my master pole only to keep the hose away from the structure and for convenience when doing fast 2nd and 3rd story work.