Thanks for those replies, very helpful, As I am using T/M which has a continuos feed of the rinsing product from a attached container, its impractical to keep changing product for different types of carpet. Having used Hydra dri for a long period previously ,and having many repeat customers mostly better end 80/20 wool, I never had aproblem with a carpet after cleaning(as far as Im aware) How many of you guys have had a browning problemA, at all, or B, after using a high PH product? Cheers Simon