I just bought 3 oz and a breeder from florida aqua farms.......going to give it a try from a few different angles to see if i can get something to work, would love to feed my wrasses more often.
Such a device will work just fine, but if you can't bring yourself to spend $35 to hatch brine shrimp, there are much less expensive alternatives. Here is one way.
Get a 1 gal glass jar, or similar container. A round one is bes, but any one will do.
Also get a small air pump, a length of air line tubing and an small airstone.
You'll also need brine shrimp eggs and salt. Use cheep aquarium salt for this, not expensive salt for making SW.
Set up the jar so that it's elevated about3/4" on one side. Some people build a special rack. I just use a paperback book or small board.
Set up the air pump above the jar and connect it to the airstone which goes in the jar. Connect the air pump to power.
Add 2 quarts of dechlorinated water, or RO water to the jar.
Add 2 tablespoons of salt and let it dissolve. Use the dip and scrape level, like the show you on the cooking shows.
Add up to 2 teaspoons of brine shrimp eggs.
Wait 1 day if the water is about 80 or higher, or wait two days if at room temp, about 72 or so.
Turn off the air pump, and wait for things to settle out. You'll get a layer of brown egg shells ar the bottom, a layer of orange brine shrimp above them, more or less clear water, and floating on the top, more brown egg shells. If the shrimp don't separate out too well you can add a quart of dechlorinated water, or RO water, to change the SG and help the shrimp to settle out.
Use a length of airline tubing to siphon out the brine shrimp. Use a shrimp net or cloth handkerchief to catch the brine shrimp.
Feed them to your live stock, or put them in you grow out container.