I'm not sure if these are suitable for use with Van Ness self-straining litter boxes but I use them in a regular litter box. It seems like a good idea to have them clear away all the debris, but really all they do is keep the plastic from rotting. When cats use them, they just make big holes in the bottom of the bag. When you pick it up you have to transfer the bag to another one as the trash just squirts out. Good to have if you just want to protect the plastic.
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