Experiences with silicate cat litter?

Kajsa and Tessa have 2 litter trays. I’m about replacing one of them, but I thought I could use the time with 3 boxes for some experiments. So for now they’ve 2 trays with their normal litter and a third with silica gel litter.

To make sure that I know what they like / dislike, the new litter is in a familiar box and location.

experiences with silicate litter

They’ve ignored the box for over a week now. They only use the two trays with their normal litter, although one of the boxes is now on a new spot. So I’m pretty sure that they don’t like the new litter (since box and location are familiar).

How long would you keep trying? Is one week long enough? I’ve one more litter I’d like to test, so I’m thinking of putting the silicate litter away. (I’m happy that I don’t have to trash it: my friend’s cat likes silicate litter, so he’ll get it). Do you have experiences with silica gel litter?