I have never had them for my cat. But I was recently told by a person that said they let their cats use them, they did't work that well.
I have my plants in a room Sunny can't go in, in the green house. I also had a cat once that prefered a potted plant to the litter box.
When I did not have a green house I put them in a different room from where the cat could go.
I hope you good luck.
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