Does it say on the bag what its made of?

Clumping litter could merge into an impervious layer on the soil surface. Old style fired clay litter would be safer.

I've had good results from sheep wool pellets. Pricey though.

Would coffee grounds work? Some cafes will give them away if you ask.

That cat type litter is also used to put on oil, petrol and diesel spills so it would probably suck up all the moisture round your plants too.