Oy. It is a supposed bacterial product, using a "proprietary blend" of bacteria, which can somehow work in freshwater, marine, low oxygen, high oxygen, really -- anywhere! I'm more than a little skeptical. It has a shelf life of 4-years?
The bacteria that work in our filters are actually somewhat delicate; they're hard to culture, and they're hard to keep alive outside of the tank. I think this is yet another bottle of snake-oil.
Seriously, if you need bacteria to get a tank cycled, I'll trade you a new sponge filter for an old one. Take it to your tank, squeeze all the gunky goodness into your tank, and instantly cycled.