While the chamber was created so that Barry could boost his cognitive abilities, Team Flash ends up employing MAC to contain synaptic energy, which allows Chester to merge his consciousnesses back together again.
“Chester is doing so much better,” Cecile reveals. “I mean, don’t get me wrong. He’s still glowing in the eyes with orange dark energy, but he’s in really good spirits.” Cisco chimes in to add, “Caitlin said his molecules need to re-stabilize at the subatomic level. My guess is he’ll need to cook in the M.A.C. for another four to six weeks, maybe more, to get back to normal.”