Long water fed poles are great for a few jobs reaching over conservatories and getting to velux windows etc. But for most domestic jobs I've found that my 17 foot is ideal.
But for a few jobs it's maybe a bit too long when closed up. I'm talking about those jobs where you've got windows in a passageway or down the side of a conservatory where there's a wall or flowerbed nearby.
In these cases, the ideal pole would be much shorter to stop you knocking the back end on a wall and getting snagged in rose bushes and the like.
Here's my Harris pole. With the angle adaptor and brush it's 1m46 or 4' 9" in old money:
The trigger is re-cycled from a Numatic carpet cleaner that I'm now using as a gutter vac. The single jet in the brush is also recycled from the same carpet cleaner.
The brush is a Salmon. It's heavy, but for a downstairs brush it's fantastic. The hole was made by drilling a 22 mm hole from the front and a 13 mm hole from the back. The 22 mm hole was so I could hold the jet in a socket while I tightened the hosetail on the back. It was drilled deep enough to allow plenty of thread to protrude from the back to screw the hosetail on to. Despite having so many bristles removed, it's still got loads of scrubbing power.
As you can see, I can also use the brush with two jets. They're the economy fan jets from cleaningspot and they work just fine. They are a straight swap for pencil jets.
I don't need it on most jobs, and it's a bit of a luxury. But the 30 seconds or less that it takes me to swap over poles is more than repaid in speed doing the tricky downstairs on a few jobs.
And making the whole thing only took me a couple of hours and used scrap bits I had lying around the garage.