Catsan should be fine, and shouldn't harm him if he licks his paws. Generally, you should scoop at least once a day, and change the litter once a week. There are some clumping litters which are good for about two or three weeks, while non-clumping should be completely changed every week.
Here's an article about litter box maintenance: http://www.thecatsite.com/Care/29/Li...intenance.html
Good luck with Figo!