A lot of unexpected things can occur when you are experimenting with practices that you have not yet gotten accustomed to. This goes for carpet cleaning most of all, and a big part of the reason why that is the case has to do with the fact that inexperienced carpet cleaners often spot brown stains on a carpet that they have recently cleaned with all of the physical energy they had in their body at any given point in time. Seeing stains after you had put so much effort into cleaning a carpet is liable to drive you stark raving mad, but understanding the root cause of this phenomenon can soothe your mind in some way, shape or form.
We would love to give you a single explanation for why your carpet turned brown after you used Friendswood carpet cleaning methods on it. However, suffice it to say that there is no one reason for why this occurs. If your entire carpet has turned brown, chances are that this is because of the pH level becoming unbalanced.
On the other hand, if only certain spots are turning brown, this is an indication that dirt trapped deep inside the carpet is now rising to the surface. That is actually a good thing, because it means that you are making some headway in your pursuit of the cleanest carpet out there. All you should do is clean the rug once more and pay special attention to the brown patches. If the rug is brown because of a pH balance, sprinkling some baking powder on it might help reverse the reaction although this might not always end up working.