After skimming and bailing down to 1/3 gallon, slowly refill the jar with tap water.
...and bail again using the same procedure as above.
You should now see the brine shrimp at the bottom of the jar. The less Calcium Hydroxide you used, the darker brown the brine shrimp will be. Whereas, the more Calcium Hydroxide used the pinker the shrimp will be.
You want the shrimp to be slightly pink to make it easier to identify how much of your shrimp is hatched. If you used 4 to 5 coke spoons of Calcium Hydroxide, the shrimp should be very pink, albeit some have been cooked in the caustic mix, but the fish and their fry will still consume them. This is why it is important not to use too much Calcium Hydroxide. If you do not have this caustic material and do not intend to buy it, there will be no great harm in omitting it from your list. We are using it simply to be able to tell for certain when the greater majority (90%) have hatched.
After two good bailings, the top of the water should look like this. nearly husk free. If the majority of your shrimp have not hatched, fill the jar again, replace the water (you may use tap water at this point), check the salinity, give them some more food, and hit it with air for a few more hours.
If you keep the hatched shrimp in the jar with air going and the proper salinity, they will live for days provided you feed them. Yes, if you do this correctly, there will be a rather faint, yet foul odor near the jar. This is normal. What you have recreated is the stinky Great Salt Lake in a jar.
When your shrimp are ready, pour them into your tank or feed them by the cupful into your tanks. Its completely up to you. Yes, you may need to change the water in your tank more often, however the trade off is spectacular!
If you keep cheap feeder guppies, within three days you should notice fry all over in the plants.