I have two kittens (one is 6 months the other is 3 months). I had feline pine in each of their boxes for only two days. Both cats HATE this stuff! My 6 month old reluctantly pooped once in it and managed to kick poop out of his boda house when he was trying cover it. We followed the directions and used 1/2 old litter 1/2 pine to try to convert them. We put the regular litter in and he ran in and pooped 3 times. The pellets don’t stick to the poop plus, the urine disintegrates the pellets and you have saw dust at the bottom. The three month old use it once over the two days and then pooped in his regular litter as soon as we changed it. I felt so bad for them. They are both such good kitties, they held themselves for almost two days because they didn't want to use it! I really want to find an environmentally friendly good litter.