Berber is a type of carpet that can last till the end of time but with the cost of it getting dirty fairly quick. Having said that, it does clean up great and can be maintained pretty well if on a 6-8 month scheduling period.
One of the hardest areas when cleaning carpets is when there is something on top of the carpet; this case being a plastic office mat. Of course, this saves the carpet from being damaged by the rollers as well as the graphite powder that can ruin carpets. But you can see how well berber does clean up from our extraction methods making it almost new.