I got the baby brine shrimp (BBS) hatchery that is also sold in Aquarium Co-Op and had no problems hatching them. For a 1 liter bottle, I use 1 Tbsp of aquarium salt, a pinch of baking soda, and 1/4 to 1/2 tsp of BBS eggs. Use an air pump to keep the water bubbling and a desk lamp to keep the temperature at 80-82 degF. After 24 hours, I collect the hatched BBS and scrub out the hatchery with hot water. To keep the eggs lasting longer, I refrigerate the container but I've heard you can also freeze them.
I'm sure they're fine but are a little complicated for me to get started right now. I don't have a good set up for them.
Once you stop messing with it and let it sit for 24 hours the eggs will hatch. I made a hatchery for these out of a water bottle and an air pump and it worked fine. It has a high hatch rate for all my guppy fry. :)