If anyone wants to try Katkin and I can give you a referral code for money off.
More importantly I am finding their litter really fabulous.
Clumps well, contains smell, far less tracking that everything else I've tried, seems to have good environmental credentials. Previously used VanCat after trying everything else on the market. Big plus is the less tracking and much lighter when I shake the litter tray playing hunt for the deeply buried clumps.
You can get 50% off the first bag of litter to try it out as it's not the cheapest.