We have 3 cats and 2 giant litter boxes.....no problem.

I use Wal-mart brand kitty litter "Special Kitty" and there too, no problem. It is MUCH less expensive than a brand name, and works just as well.

I have always used this brand of litter even when they were babies. Never knew that there might be a problem with it. I don't know about your cats, but I know mine would never injest the litter........too picky about what they eat!

Good luck in getting a new addition.