Hi Jas
The only Prochem presprays I use are Powerburst (high ph and must be acid rinsed, but very effective) and Pure Clean (great for cleaning "clean" carpets, if you know what I mean). I do have Ultrapack on the van, but use it very infrequently.
I cleaned a tennis club's main bar carpet this afternoon, absolutley minging, blasted with hot Powerburst and hot rinsed with Fib/Fab, great results and client over the moon.
Steve