When trying the treatment recently — which can range from a quick, 30-minute lunchtime session (about $150 and up) to more involved versions that add in LED light therapy, oxygen, and more (about $200 and up) — I found the process so gentle, I wondered if it was doing much of anything at all. Then my facialist popped a receptacle out of the machine to show just how hard she and that multi-tasking tip had been at work: The bowl contained murky gray water dotted with floating particles for a view both satisfying (yay! Look at all that muck no longer in my pores) and gross (was all that mess really in my skin?).