Fresh Wave Odor Eliminating & Deodorizing Packs | 2 Bags of 6 Each | Safer Odor Relief for Small Spaces | Natural Plant-Based Odor Eliminator | Odor Absorbers for Home, 3.6 Ounce (Pack of 2)

I'd been buying these as a cheaper alternative to what Whisker sells: https://www.amazon.com/dp/B01DEAA3O0 They keep the waste drawer's smell from ever getting too bad and seeping out of the machine. But if you think it's the liner, you either might be really unlucky with cats with weird biology, or it might be a litter problem. What kind of litter do you use? I've read a lot of testimonials over the last couple of years where people using certain types of litter end up with dirtier/smellier than usual robots.