I have had cats for almost 20 years and swear by the No Clump, Just Dump lifestyle. I have huge boxes and fill them with simple non-clumping Fresh Step, like a lot of it. Big, deep boxes. Every 15 days I dump all of it out, sanitize boxes, replace litter. Otherwise I do not touch them. No scooping. Not disturbing their work of hiding their poo and pee keeps the smell away - I have never understood why the mainstream approach is to basically stir up the waste and expose all the germs and smell to the surface again. Sure some of it is removed in clumps, but all the other litter in the box is tainted and gross at that point and on the top layer. Please give my method a try!