I was looking at these the other day & decided it would be FAR cheaper to just buy the U shaped tool that fits the top of ur pole, then buy a Henry hoover & long hose- Bobs ur uncle!

See bellow got to be ok for domestic other wise have seen new 3 motor industrial machines on ebay for under £300 delivered 


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Ionic about 4 grand or less

Iv just brought a 3 motor vacuum from ebay runs off domestic plug 3.3KW so probably only use 3rd motor for short runs clearing downpipes or big lumps sucks fingers off with 2 on 

Im going to make my own pipes can get lengths of 5 meter 2 inch OD from metal suppliers got to machine the slot in parts & get stainless clamps will be a dam site cheaper than full blown Omnivac system etc.

Keep an eye out on diy section  if it works fine I may be able to make a few more pipe sets for people long as I cover costs.