"I have guinea pigs so I use nothing but CareFresh litter. Most of the litter in the cage is the grey basic type but I always sprinkle the color on top. The colored CareFresh is the Ultra type so it locks in the odors better which boosts the basic litter. The main reason I like it is that it helps relieve the boring grey for both the guinea pigs and the people in our house. Guinea pigs can definitely see color and they will pick up and move the colored bits around to suit them so they really have fun with the confetti mixture. I also like that the Confetti version comes in larger bags than the solid colors."