Valid points indeed but I have had only done one job for five stories in all the time I have had the system. Most I do seems to be a max of four. Maybe because I live in the west country.
You did need a second person with a support pole but at the costs to clean 5 stories, employing someone for the day Is factored into the cost.
To be honest any thing higher than four stories you need a cherry picker, because accidently dropping pieces of slate or large sections of turf down from the nozzle at that height is quite frankly dangerous.
Apart from Glenn I probably am one of the most experienced users or the Omnivac system, as its pretty much in constant use.
The system has height limits because of falling debris that the nozzle is too small to suck up. Also breaking up of this debris with a hook is next to impossible at this height. Also when you use the pole you are standing right under the gutter in the prime area for falling debris strike. 48 ft is the limit for the omnivac system for very good reason.
I have seen Mr Hs system and It is all he says it is, but I have considered cleaning gutters above five stories and with a carbon fibre pole or an aluminum pole I believe its to dangerous for the operator just because of the falling debris issue. I will not be buying a carbon fibre pole for this reason alone, nothing to do with wear or weight.
Mr H has said also that he would buy the Omnivac pole for the lower level stuff (up to 4 stories?) so with that in mind as well as our own diy expert Jeff Brimble buying the Omnivac system the answer in my eyes is very clear.
