Hi Guys,
Flotex recommend a low detergent approach because of its low pile.It is always sensible to use the minimum of detergent needed , which means that if the carpet is really dirty then you will need a high quality pre spray and maybe quite a lot of it.
It would seem sensible to extract with plain water as a final step.
In a previous life I have been to the Flotex factory having been responsible for developing the glass fibre base which gives it , its dimensional stability.
A PVC paste is coated onto the base and while it is still gungy(technical term), electrostatically charged nylon fibres are 'inserted' into it.This gives the effect of a very high density nylon carpet .
This is obviously pretty tough and will not be harmed by detergents as long as they are rinsed out.
The reason you can use lots of water is that little of it will penetrate because of the pile density.
Fairy liquid is extremely difficult to rinse out and is not generally part of the professional carpet cleaners range

For more info go to
www.flotex.co.ukCheers,
Doug