Just bought this myself. I got lazy and decided to try it with just some of my reef water since itd be going back in my tank anyways with the brine and within 24 hours i was getting lots of shrimp! Pretty impressed with this to say the least. My only little "gripe" is that i feel the baby brine are super tiny so only my smallest corals might get one or two of them
Yes, baby brine shrimp are tiny, but I was able to use that fact to feed newly hatched clown fish in the 80's. Little was published back then on how to raise the fry.
I had a breeding clownfish pair I collected in the Arabian Gulf back before the wars. They spawned every month, but couldn't get any to live until I fed them brine shrimp immediately after both the shrimp and the clowns hatched. With the multiple shrimp hatchers, I was able to work it out. Note that I wouldn't recommend this approach today as there are better ways to feed newly hatched clowns.
But, my success was short lived. The first Gulf War broke out and I lost power, a/c, all my fish and any chance to go back to get more.
By the way, the tiny ones get bigger as they absorb their yoke sacks. Thus too big for baby clowns. If you want to grow them bigger, that becomes a lot more complicated.