2pcs Dirty Water Tank Deodorizing Particle Accessories Compatible with Roborock Saros 10/10R Silver Ion Anti-Odor Module,Sewage Deodorizing Particles, Silver Ion Module

That does look the white thing in the picture although the listing doesn’t mention the Saros 10r. So that may answer that but what about the empty slot? The dirty side has a similar spot that I found the item for it. https://a.co/d/0emyGQWy