The tea sieve method:
This method works perfect if one is forced to use bad Artemia with many egg-relics. Mostly eggs (cysts) and hatched animals are of different size. The supposition that both are of the same size is wrong. In any brand he eggs (cysts) are more or less bigger.
But:
– mind, that there are different species and variants of Artemia that all differ in the size of the cysts and the size of the hatched naupliae, and
– mind, that there are many different sieves for tea.
Olivier Perrin, one of the best breeders worldwide of Paro’s, phaerichthys vaillanti and other blackwater fish from south-east Asia showed a perfect match to me: He uses a special Artemia brand with a special size of cysts and hatched animals, and he had a perfect match of a tea sieve accordings to that sizes. It sorts out unhatched eggshells at about 100%.