Arm & Hammer Clump and Seal - this stuff is worth its weight in gold! I have the stinkiest cat in the world, we have taken him to the vet and tested for kidney problems and everything, its THAT bad. I have to literally scoop the litter 4-5 times a day. This stuff is crazy, I just realized I haven't cleaned it since Wed. morning and not one scent. I sound like a commerical, but it is that good!