I wouldn't see any need to mix the Schultz with kitty litter. The only thing about Schultz is that its very light weight. It helps to mix it with a little gravel just to give it more weight. One tip, Schults also makes something called clay conditioner, same exact stuff, but a lot cheaper. 40 pound bag for about $12. You find it in garden centers.
BTW, kitty litter is NOT laterite. Laterite is simular to clay, but is mostly aluminum oxide and very high in iron. Its dark red in color. Its mostly found in the tropics. Not all kitty litter is made of clay. Some is just processed paper or wood pulp.
Robert Paul Hudson
RAOK Club #1
Kindness like love is unconditional