I'm not sure as I don't really go to petsmart, I try not to support the big box stores and instead go to the LFS even if it means spending an extra few dollars. But it is the nutrafin co2 kit. I bought it with the intention of using my own yeast sugar mix and basically just packaging DIY into the nutrafin container instead of using soda bottles. However, after receiving some opinions I am using up the commercial packets that it came with and they seem to be working ok although I've read they die out fairly quick. Its been up for two weeks now and still running pretty strong.