Effective for absorbing odors from LitterMaid automatic litter tray (old name). It sticks well to hold in place without ever falling. On the other hand, if you want to extend the use of the plastic tray by emptying me instead of throwing it away each time, we have to think about changing the deodorant frequently. It can be a bit difficult to peel it off the lid for replacement. I wish they were not sold separately because one does not go without the other, in my opinion. In summary, good product, effective and useful but one must think about buying them separately from plastic trays.
