the hose that comes with adapter is only meant to be used from adapter to brush head i think.
That would be an 8m loop from Aqua-dapter to brush head

Spruce is right, most other hoses have too much stretch to operate it properly.
The standard orange hose supplied is tougher than most other available, the dark red hose is actually a little stiffer and has even less stretch, some customers prefer the red, but some still like the orange. We recommend the red for hot water and for longer poles, as any stretch is exaggerated over a longer length.
Paul