Hello and Welcome!
Bio-Spira is an excellent product, but as others have stated, it must be properly handled.
I have two LFS in opposite directions from my home. One, in an affluent area, has a lot of high-end products, and seems to specialize more in Saltwater than Fresh. They carry a staggering array of products including Bio-Spira.......which they stock in cardboard boxes inside a display case at the register.
On the other hand, the other LFS located in an older and somewhat depressed strip mall has been around for a couple hundred years. Much of their product stock is older and dusty, lots of parts for older filters, etc. However, they are very knowledgeable, and concentrate on customer service rather than aisles full of the latest wet/dry sumps. Their stock of Bio-Spira is kept refrigerated, and when purchased is packaged with an ice pack for the journey home.
I've had excellent results using Bio-Spira and even cycled a tank with sky high Ammonia and Nitrite readings overnight (well....actually about 20 hours). I highly recommend it, but make sure the retailer you purchase it from, knows how to handle it.
OH, I almost forgot to mention the Bio-Spira should be added to a new tank at the same time as fish. It can be added a little after the fish as well. If added before the fish, it will starve.