i always use an acid rinse when i have presprayed with powerburst or multi pro which i tend to use most of the time.when i talk to other carpet cleaners with tms they look down their noses and tell me they use crystal green,extraction pro ,ultimate master etc!
i know that you could probably get away with it for many years,i have done a few jobs which have turned out great wher i have not knowingly rinsed with no rinse getting through the system.
surely a light wool carpet presprayed with powerburst or similar would be very risky??
gary