Hi Paul
I usually spray just enough to lightly mist the carpet.I would say about just under a litre as a rough guess seems to work for me .
good Agitation is the key
Neil
No wonder your tub of Blitz has lasted all these years Neil... 
Colin You haven,t got some i could borrow have you I,ve ran out lol
Typical Yorkshireman....
!
On a serious note, I have some Extracta contrachem if you want to take that, and some of that fine line stuff too...
That would be great Colin Thanks
This is My take on pre Sprays Use as high a alkaline chem as possible on everything.
dont even bother with acid rinse if its dirty
If its a fairly good wool carpet then i would use micro splitters
all you need as a carpet cleaner is 5l micro splitter and 50kg of blitz
