Why did I try the above litter after all I said in my review of another popular, similarly priced and similarly names cat litter?....
Well you can see my review of the other one (The World's Best) on the latter's page: and which, though better than all other litters we'd tried up til then, still had a major failing. Which was that although it stated you could leave the litter for up to 2 weeks without a full change for one cat, with our 2 small kittens we found that the litter very quickly absorbed very unpleasant smells, (within about 4 days) even when properly filtered... BUT this doesn't happen with the Okoplus... In fact I've only completely changed the litter 3 times since the beginning of October, and otherwise just replace the dirty litter that has been removed with fresh, and theres no absorbed smell AT ALL!... This makes it really economical.
The only negative I've found is that the Cat's Best Okoplus does track out of the litter tray more than the, 'World's Best', which does annoy my rather house proud husband who does the hoovering and dusting downstairs! But I can live with that far more than his complaints about the smell from the World's Best litter. (Mind you, much like a shark detects blood, he can detect a molecule of unpleasant smell in a whole houseful of air!)
Anyway, unless the kits have consumed some particularly sloppy food which affects their insides (if you know what I mean) then the Cat's Best Okoplus masks ALL smell completely. - Highly recommended.