So I put one of these in the same room as the litter box and I no longer smell the box. Literally the box has no smell unless you get a lot closer to it. I put one next to my trash and recycling, which sometimes stinks, and nothing, completely odorless. This works beyond my expectations. Actually you don't smell the gel at all, which is normal, the scents don't overlap when using scented candles or similar. I apply it in the car, at low speed, close enough to smell the gel and it smells nice, not disturbing. You work seriously. I haven't had them long enough to know how long they will last, only a few weeks so far, but I'm very happy with them. I don't smoke or do anything that causes serious odors so I can't say if they work in these situations but I know they work better than I previously expected. A good buy for sure.
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