truth was lads I completely f***** up the pricing on this job. For some reason, I underquoted it by probably a couple of hundred but in truth I probably didnt have the right set up to do the job. hence the eight hours.
I am thinking about getting a rotary something dual speed 200 and 400 rpm with a carpet brushes, pad attachments etc...
I pre-vacced using a sebo bs36, pre-sprayed with powerburst and agitated with a duo. The amount of dirt that came out was incredible (the waste water was pitch black when I emptied it) but i still felt that that there was probably as much dirt down there as I took out.
It later became known that the carpet hadnt been cleaned in about five years and its down a very busy office area.
So really, I should have vacced, pre-sprayed, then agitated with a rotary and then extracted with the portie. The vacs on the portie are upgraded to the new 5.7" high suction motors and they were literall ripping the tiles off the floor. After I should have bonnetted to remove anything left on.
thanks lads...