The mill protection diminishes over time as a result of traffic, vacuum brush agitation (beater bar) and cleaning. Fluorochemical wears off more readily through frictions and the acid dye resistor is remove more readily through cleaning. The secondary market protection replenishes the base protector. The degree of replenishment is determined by the frequency and volume of application. Recently, I have heard that some of the carpet mills have stopped applying a fluorochemical in manufacturing. Darrel Hagen of Shaw stated that they have already made the transition.
My wife has retired and we have been making some cosmetic changes to the house. We were looking at nylon samples. I took them to the lab and tested for water and oil repellency. Fortunately, my wife chose the Karastan which has excellent oil and water repellency. However, if she had chosen one of the others, then I would have applied our Maxim Advanced to the new carpet. Has anyone else heard about these changes?